🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 14 (from laksa181)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa014.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://cplusplus.com/reference/queue/queue/size/\')), getAhrefsUnparsedNoserviceFromURL(\'https://cplusplus.com/reference/queue/queue/size/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/cplusplus.com\/reference\/queue\/queue\/size\/","crawl_time":1773929733,"first_indexed_time":1654827792,"http_code":200,"src_unparsed":"com,cplusplus!\/reference\/queue\/queue\/size\/ s443","src_root_hash":"7671136614093794214","history_drop_reason":null,"meta_title":"","meta_descriptions":[],"attrs_boilerpipe_text":"public member function\n<queue>\nstd::\nqueue\n::size\nsize_type size() const;\nReturn size\nReturns the number of elements in the\nqueue\n.\nThis member function effectively calls member\nsize\nof the underlying container object.\nParameters\nnone\nReturn Value\nThe number of elements in the\nunderlying container\n.\nMember type\nsize_type\nis an unsigned integral type.\nExample\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n\/\/ queue::size\n#include <iostream>\n\/\/ std::cout\n#include <queue>\n\/\/ std::queue\nint\nmain ()\n{\n  std::queue<\nint\n> myints;\n  std::cout <<\n\"0. size: \"\n<< myints.size() <<\n'\\n'\n;\nfor\n(\nint\ni=0; i<5; i++) myints.push(i);\n  std::cout <<\n\"1. size: \"\n<< myints.size() <<\n'\\n'\n;\n\n  myints.pop();\n  std::cout <<\n\"2. size: \"\n<< myints.size() <<\n'\\n'\n;\nreturn\n0;\n}\nOutput:\n0. size: 0\n1. size: 5\n2. size: 4\nComplexity\nConstant (calling\nsize\non the\nunderlying container\n).\nData races\nThe container is accessed.\nException safety\nProvides the same level of guarantees as the operation performed on the container (no-throw guarantee for standard container types).\nSee also\nqueue::empty\nTest whether container is empty\n(public member function)","attrs_markdown":"[cplusplus .com](https:\/\/cplusplus.com\/)\n\n- [TUTORIALS](https:\/\/cplusplus.com\/doc\/)\n- [REFERENCE](https:\/\/cplusplus.com\/reference\/)\n- [ARTICLES](https:\/\/cplusplus.com\/articles\/)\n- [FORUM](https:\/\/cplusplus.com\/forum\/)\n\n![](https:\/\/cplusplus.com\/img\/progress.gif)  \nplease wait\n\n[try again]() [cancel]()\n\n[forgot your password?](https:\/\/cplusplus.com\/user\/access.cgi?w=lostpass)\n\n[sign up](https:\/\/cplusplus.com\/user\/access.cgi?w=signup) [log in]()  \n[\\[Legacy version\\]](https:\/\/legacy.cplusplus.com\/reference\/queue\/queue\/size\/)\n\n### **[C++](https:\/\/cplusplus.com\/)**\n- [Tutorials](https:\/\/cplusplus.com\/doc\/)\n- [Reference](https:\/\/cplusplus.com\/reference\/)\n- [Articles](https:\/\/cplusplus.com\/articles\/)\n- [Forum](https:\/\/cplusplus.com\/forum\/)\n\n### **[Reference](https:\/\/cplusplus.com\/reference\/)**\n- #### [C library:](https:\/\/cplusplus.com\/reference\/clibrary\/)\n  - [\\<cassert\\> (assert.h)](https:\/\/cplusplus.com\/reference\/cassert\/ \"<cassert> (assert.h)\")\n  - [\\<cctype\\> (ctype.h)](https:\/\/cplusplus.com\/reference\/cctype\/ \"<cctype> (ctype.h)\")\n  - [\\<cerrno\\> (errno.h)](https:\/\/cplusplus.com\/reference\/cerrno\/ \"<cerrno> (errno.h)\")\n  - C++11\n    [\\<cfenv\\> (fenv.h)](https:\/\/cplusplus.com\/reference\/cfenv\/ \"<cfenv> (fenv.h)\")\n  - [\\<cfloat\\> (float.h)](https:\/\/cplusplus.com\/reference\/cfloat\/ \"<cfloat> (float.h)\")\n  - C++11\n    [\\<cinttypes\\> (inttypes.h)](https:\/\/cplusplus.com\/reference\/cinttypes\/ \"<cinttypes> (inttypes.h)\")\n  - [\\<ciso646\\> (iso646.h)](https:\/\/cplusplus.com\/reference\/ciso646\/ \"<ciso646> (iso646.h)\")\n  - [\\<climits\\> (limits.h)](https:\/\/cplusplus.com\/reference\/climits\/ \"<climits> (limits.h)\")\n  - [\\<clocale\\> (locale.h)](https:\/\/cplusplus.com\/reference\/clocale\/ \"<clocale> (locale.h)\")\n  - [\\<cmath\\> (math.h)](https:\/\/cplusplus.com\/reference\/cmath\/ \"<cmath> (math.h)\")\n  - [\\<csetjmp\\> (setjmp.h)](https:\/\/cplusplus.com\/reference\/csetjmp\/ \"<csetjmp> (setjmp.h)\")\n  - [\\<csignal\\> (signal.h)](https:\/\/cplusplus.com\/reference\/csignal\/ \"<csignal> (signal.h)\")\n  - [\\<cstdarg\\> (stdarg.h)](https:\/\/cplusplus.com\/reference\/cstdarg\/ \"<cstdarg> (stdarg.h)\")\n  - C++11\n    [\\<cstdbool\\> (stdbool.h)](https:\/\/cplusplus.com\/reference\/cstdbool\/ \"<cstdbool> (stdbool.h)\")\n  - [\\<cstddef\\> (stddef.h)](https:\/\/cplusplus.com\/reference\/cstddef\/ \"<cstddef> (stddef.h)\")\n  - C++11\n    [\\<cstdint\\> (stdint.h)](https:\/\/cplusplus.com\/reference\/cstdint\/ \"<cstdint> (stdint.h)\")\n  - [\\<cstdio\\> (stdio.h)](https:\/\/cplusplus.com\/reference\/cstdio\/ \"<cstdio> (stdio.h)\")\n  - [\\<cstdlib\\> (stdlib.h)](https:\/\/cplusplus.com\/reference\/cstdlib\/ \"<cstdlib> (stdlib.h)\")\n  - [\\<cstring\\> (string.h)](https:\/\/cplusplus.com\/reference\/cstring\/ \"<cstring> (string.h)\")\n  - C++11\n    [\\<ctgmath\\> (tgmath.h)](https:\/\/cplusplus.com\/reference\/ctgmath\/ \"<ctgmath> (tgmath.h)\")\n  - [\\<ctime\\> (time.h)](https:\/\/cplusplus.com\/reference\/ctime\/ \"<ctime> (time.h)\")\n  - C++11\n    [\\<cuchar\\> (uchar.h)](https:\/\/cplusplus.com\/reference\/cuchar\/ \"<cuchar> (uchar.h)\")\n  - [\\<cwchar\\> (wchar.h)](https:\/\/cplusplus.com\/reference\/cwchar\/ \"<cwchar> (wchar.h)\")\n  - [\\<cwctype\\> (wctype.h)](https:\/\/cplusplus.com\/reference\/cwctype\/ \"<cwctype> (wctype.h)\")\n- #### [Containers:](https:\/\/cplusplus.com\/reference\/stl\/)\n  - C++11\n    [\\<array\\>](https:\/\/cplusplus.com\/reference\/array\/ \"<array>\")\n  - [\\<deque\\>](https:\/\/cplusplus.com\/reference\/deque\/ \"<deque>\")\n  - C++11\n    [\\<forward\\_list\\>](https:\/\/cplusplus.com\/reference\/forward_list\/ \"<forward_list>\")\n  - [\\<list\\>](https:\/\/cplusplus.com\/reference\/list\/ \"<list>\")\n  - [\\<map\\>](https:\/\/cplusplus.com\/reference\/map\/ \"<map>\")\n  - [\\<queue\\>](https:\/\/cplusplus.com\/reference\/queue\/ \"<queue>\")\n  - [\\<set\\>](https:\/\/cplusplus.com\/reference\/set\/ \"<set>\")\n  - [\\<stack\\>](https:\/\/cplusplus.com\/reference\/stack\/ \"<stack>\")\n  - C++11\n    [\\<unordered\\_map\\>](https:\/\/cplusplus.com\/reference\/unordered_map\/ \"<unordered_map>\")\n  - C++11\n    [\\<unordered\\_set\\>](https:\/\/cplusplus.com\/reference\/unordered_set\/ \"<unordered_set>\")\n  - [\\<vector\\>](https:\/\/cplusplus.com\/reference\/vector\/ \"<vector>\")\n- #### [Input\/Output:](https:\/\/cplusplus.com\/reference\/iolibrary\/)\n  - [\\<fstream\\>](https:\/\/cplusplus.com\/reference\/fstream\/ \"<fstream>\")\n  - [\\<iomanip\\>](https:\/\/cplusplus.com\/reference\/iomanip\/ \"<iomanip>\")\n  - [\\<ios\\>](https:\/\/cplusplus.com\/reference\/ios\/ \"<ios>\")\n  - [\\<iosfwd\\>](https:\/\/cplusplus.com\/reference\/iosfwd\/ \"<iosfwd>\")\n  - [\\<iostream\\>](https:\/\/cplusplus.com\/reference\/iostream\/ \"<iostream>\")\n  - [\\<istream\\>](https:\/\/cplusplus.com\/reference\/istream\/ \"<istream>\")\n  - [\\<ostream\\>](https:\/\/cplusplus.com\/reference\/ostream\/ \"<ostream>\")\n  - [\\<sstream\\>](https:\/\/cplusplus.com\/reference\/sstream\/ \"<sstream>\")\n  - [\\<streambuf\\>](https:\/\/cplusplus.com\/reference\/streambuf\/ \"<streambuf>\")\n- #### [Multi-threading:](https:\/\/cplusplus.com\/reference\/multithreading\/)\n  - C++11\n    [\\<atomic\\>](https:\/\/cplusplus.com\/reference\/atomic\/ \"<atomic>\")\n  - C++11\n    [\\<condition\\_variable\\>](https:\/\/cplusplus.com\/reference\/condition_variable\/ \"<condition_variable>\")\n  - C++11\n    [\\<future\\>](https:\/\/cplusplus.com\/reference\/future\/ \"<future>\")\n  - C++11\n    [\\<mutex\\>](https:\/\/cplusplus.com\/reference\/mutex\/ \"<mutex>\")\n  - C++11\n    [\\<thread\\>](https:\/\/cplusplus.com\/reference\/thread\/ \"<thread>\")\n- #### [Other:](https:\/\/cplusplus.com\/reference\/std\/)\n  - [\\<algorithm\\>](https:\/\/cplusplus.com\/reference\/algorithm\/ \"<algorithm>\")\n  - [\\<bitset\\>](https:\/\/cplusplus.com\/reference\/bitset\/ \"<bitset>\")\n  - C++11\n    [\\<chrono\\>](https:\/\/cplusplus.com\/reference\/chrono\/ \"<chrono>\")\n  - C++11\n    [\\<codecvt\\>](https:\/\/cplusplus.com\/reference\/codecvt\/ \"<codecvt>\")\n  - [\\<complex\\>](https:\/\/cplusplus.com\/reference\/complex\/ \"<complex>\")\n  - [\\<exception\\>](https:\/\/cplusplus.com\/reference\/exception\/ \"<exception>\")\n  - [\\<functional\\>](https:\/\/cplusplus.com\/reference\/functional\/ \"<functional>\")\n  - C++11\n    [\\<initializer\\_list\\>](https:\/\/cplusplus.com\/reference\/initializer_list\/ \"<initializer_list>\")\n  - [\\<iterator\\>](https:\/\/cplusplus.com\/reference\/iterator\/ \"<iterator>\")\n  - [\\<limits\\>](https:\/\/cplusplus.com\/reference\/limits\/ \"<limits>\")\n  - [\\<locale\\>](https:\/\/cplusplus.com\/reference\/locale\/ \"<locale>\")\n  - [\\<memory\\>](https:\/\/cplusplus.com\/reference\/memory\/ \"<memory>\")\n  - [\\<new\\>](https:\/\/cplusplus.com\/reference\/new\/ \"<new>\")\n  - [\\<numeric\\>](https:\/\/cplusplus.com\/reference\/numeric\/ \"<numeric>\")\n  - C++11\n    [\\<random\\>](https:\/\/cplusplus.com\/reference\/random\/ \"<random>\")\n  - C++11\n    [\\<ratio\\>](https:\/\/cplusplus.com\/reference\/ratio\/ \"<ratio>\")\n  - C++11\n    [\\<regex\\>](https:\/\/cplusplus.com\/reference\/regex\/ \"<regex>\")\n  - [\\<stdexcept\\>](https:\/\/cplusplus.com\/reference\/stdexcept\/ \"<stdexcept>\")\n  - [\\<string\\>](https:\/\/cplusplus.com\/reference\/string\/ \"<string>\")\n  - C++11\n    [\\<system\\_error\\>](https:\/\/cplusplus.com\/reference\/system_error\/ \"<system_error>\")\n  - C++11\n    [\\<tuple\\>](https:\/\/cplusplus.com\/reference\/tuple\/ \"<tuple>\")\n  - C++11\n    [\\<type\\_traits\\>](https:\/\/cplusplus.com\/reference\/type_traits\/ \"<type_traits>\")\n  - C++11\n    [\\<typeindex\\>](https:\/\/cplusplus.com\/reference\/typeindex\/ \"<typeindex>\")\n  - [\\<typeinfo\\>](https:\/\/cplusplus.com\/reference\/typeinfo\/ \"<typeinfo>\")\n  - [\\<utility\\>](https:\/\/cplusplus.com\/reference\/utility\/ \"<utility>\")\n  - [\\<valarray\\>](https:\/\/cplusplus.com\/reference\/valarray\/ \"<valarray>\")\n\n- [\\<algorithm\\>](https:\/\/cplusplus.com\/reference\/algorithm\/ \"<algorithm>\")\n- [\\<bitset\\>](https:\/\/cplusplus.com\/reference\/bitset\/ \"<bitset>\")\n- [\\<cassert\\> (assert.h)](https:\/\/cplusplus.com\/reference\/cassert\/ \"<cassert> (assert.h)\")\n- [\\<cctype\\> (ctype.h)](https:\/\/cplusplus.com\/reference\/cctype\/ \"<cctype> (ctype.h)\")\n- [\\<cerrno\\> (errno.h)](https:\/\/cplusplus.com\/reference\/cerrno\/ \"<cerrno> (errno.h)\")\n- [\\<cfloat\\> (float.h)](https:\/\/cplusplus.com\/reference\/cfloat\/ \"<cfloat> (float.h)\")\n- [\\<ciso646\\> (iso646.h)](https:\/\/cplusplus.com\/reference\/ciso646\/ \"<ciso646> (iso646.h)\")\n- [\\<climits\\> (limits.h)](https:\/\/cplusplus.com\/reference\/climits\/ \"<climits> (limits.h)\")\n- [\\<clocale\\> (locale.h)](https:\/\/cplusplus.com\/reference\/clocale\/ \"<clocale> (locale.h)\")\n- [\\<cmath\\> (math.h)](https:\/\/cplusplus.com\/reference\/cmath\/ \"<cmath> (math.h)\")\n- [\\<complex\\>](https:\/\/cplusplus.com\/reference\/complex\/ \"<complex>\")\n- [\\<csetjmp\\> (setjmp.h)](https:\/\/cplusplus.com\/reference\/csetjmp\/ \"<csetjmp> (setjmp.h)\")\n- [\\<csignal\\> (signal.h)](https:\/\/cplusplus.com\/reference\/csignal\/ \"<csignal> (signal.h)\")\n- [\\<cstdarg\\> (stdarg.h)](https:\/\/cplusplus.com\/reference\/cstdarg\/ \"<cstdarg> (stdarg.h)\")\n- [\\<cstddef\\> (stddef.h)](https:\/\/cplusplus.com\/reference\/cstddef\/ \"<cstddef> (stddef.h)\")\n- [\\<cstdio\\> (stdio.h)](https:\/\/cplusplus.com\/reference\/cstdio\/ \"<cstdio> (stdio.h)\")\n- [\\<cstdlib\\> (stdlib.h)](https:\/\/cplusplus.com\/reference\/cstdlib\/ \"<cstdlib> (stdlib.h)\")\n- [\\<cstring\\> (string.h)](https:\/\/cplusplus.com\/reference\/cstring\/ \"<cstring> (string.h)\")\n- [\\<ctime\\> (time.h)](https:\/\/cplusplus.com\/reference\/ctime\/ \"<ctime> (time.h)\")\n- [\\<cwchar\\> (wchar.h)](https:\/\/cplusplus.com\/reference\/cwchar\/ \"<cwchar> (wchar.h)\")\n- [\\<cwctype\\> (wctype.h)](https:\/\/cplusplus.com\/reference\/cwctype\/ \"<cwctype> (wctype.h)\")\n- [\\<deque\\>](https:\/\/cplusplus.com\/reference\/deque\/ \"<deque>\")\n- [\\<exception\\>](https:\/\/cplusplus.com\/reference\/exception\/ \"<exception>\")\n- [\\<fstream\\>](https:\/\/cplusplus.com\/reference\/fstream\/ \"<fstream>\")\n- [\\<functional\\>](https:\/\/cplusplus.com\/reference\/functional\/ \"<functional>\")\n- [\\<iomanip\\>](https:\/\/cplusplus.com\/reference\/iomanip\/ \"<iomanip>\")\n- [\\<ios\\>](https:\/\/cplusplus.com\/reference\/ios\/ \"<ios>\")\n- [\\<iosfwd\\>](https:\/\/cplusplus.com\/reference\/iosfwd\/ \"<iosfwd>\")\n- [\\<iostream\\>](https:\/\/cplusplus.com\/reference\/iostream\/ \"<iostream>\")\n- [\\<istream\\>](https:\/\/cplusplus.com\/reference\/istream\/ \"<istream>\")\n- [\\<iterator\\>](https:\/\/cplusplus.com\/reference\/iterator\/ \"<iterator>\")\n- [\\<limits\\>](https:\/\/cplusplus.com\/reference\/limits\/ \"<limits>\")\n- [\\<list\\>](https:\/\/cplusplus.com\/reference\/list\/ \"<list>\")\n- [\\<locale\\>](https:\/\/cplusplus.com\/reference\/locale\/ \"<locale>\")\n- [\\<map\\>](https:\/\/cplusplus.com\/reference\/map\/ \"<map>\")\n- [\\<memory\\>](https:\/\/cplusplus.com\/reference\/memory\/ \"<memory>\")\n- [\\<new\\>](https:\/\/cplusplus.com\/reference\/new\/ \"<new>\")\n- [\\<numeric\\>](https:\/\/cplusplus.com\/reference\/numeric\/ \"<numeric>\")\n- [\\<ostream\\>](https:\/\/cplusplus.com\/reference\/ostream\/ \"<ostream>\")\n- [\\<queue\\>](https:\/\/cplusplus.com\/reference\/queue\/ \"<queue>\")\n- [\\<set\\>](https:\/\/cplusplus.com\/reference\/set\/ \"<set>\")\n- [\\<sstream\\>](https:\/\/cplusplus.com\/reference\/sstream\/ \"<sstream>\")\n- [\\<stack\\>](https:\/\/cplusplus.com\/reference\/stack\/ \"<stack>\")\n- [\\<stdexcept\\>](https:\/\/cplusplus.com\/reference\/stdexcept\/ \"<stdexcept>\")\n- [\\<streambuf\\>](https:\/\/cplusplus.com\/reference\/streambuf\/ \"<streambuf>\")\n- [\\<string\\>](https:\/\/cplusplus.com\/reference\/string\/ \"<string>\")\n- [\\<typeinfo\\>](https:\/\/cplusplus.com\/reference\/typeinfo\/ \"<typeinfo>\")\n- [\\<utility\\>](https:\/\/cplusplus.com\/reference\/utility\/ \"<utility>\")\n- [\\<valarray\\>](https:\/\/cplusplus.com\/reference\/valarray\/ \"<valarray>\")\n- [\\<vector\\>](https:\/\/cplusplus.com\/reference\/vector\/ \"<vector>\")\n- C++11\n  [\\<array\\>](https:\/\/cplusplus.com\/reference\/array\/ \"<array>\")\n- C++11\n  [\\<atomic\\>](https:\/\/cplusplus.com\/reference\/atomic\/ \"<atomic>\")\n- C++11\n  [\\<cfenv\\> (fenv.h)](https:\/\/cplusplus.com\/reference\/cfenv\/ \"<cfenv> (fenv.h)\")\n- C++11\n  [\\<chrono\\>](https:\/\/cplusplus.com\/reference\/chrono\/ \"<chrono>\")\n- C++11\n  [\\<cinttypes\\> (inttypes.h)](https:\/\/cplusplus.com\/reference\/cinttypes\/ \"<cinttypes> (inttypes.h)\")\n- C++11\n  [\\<codecvt\\>](https:\/\/cplusplus.com\/reference\/codecvt\/ \"<codecvt>\")\n- C++11\n  [\\<condition\\_variable\\>](https:\/\/cplusplus.com\/reference\/condition_variable\/ \"<condition_variable>\")\n- C++11\n  [\\<cstdbool\\> (stdbool.h)](https:\/\/cplusplus.com\/reference\/cstdbool\/ \"<cstdbool> (stdbool.h)\")\n- C++11\n  [\\<cstdint\\> (stdint.h)](https:\/\/cplusplus.com\/reference\/cstdint\/ \"<cstdint> (stdint.h)\")\n- C++11\n  [\\<ctgmath\\> (tgmath.h)](https:\/\/cplusplus.com\/reference\/ctgmath\/ \"<ctgmath> (tgmath.h)\")\n- C++11\n  [\\<cuchar\\> (uchar.h)](https:\/\/cplusplus.com\/reference\/cuchar\/ \"<cuchar> (uchar.h)\")\n- C++11\n  [\\<forward\\_list\\>](https:\/\/cplusplus.com\/reference\/forward_list\/ \"<forward_list>\")\n- C++11\n  [\\<future\\>](https:\/\/cplusplus.com\/reference\/future\/ \"<future>\")\n- C++11\n  [\\<initializer\\_list\\>](https:\/\/cplusplus.com\/reference\/initializer_list\/ \"<initializer_list>\")\n- C++11\n  [\\<mutex\\>](https:\/\/cplusplus.com\/reference\/mutex\/ \"<mutex>\")\n- C++11\n  [\\<random\\>](https:\/\/cplusplus.com\/reference\/random\/ \"<random>\")\n- C++11\n  [\\<ratio\\>](https:\/\/cplusplus.com\/reference\/ratio\/ \"<ratio>\")\n- C++11\n  [\\<regex\\>](https:\/\/cplusplus.com\/reference\/regex\/ \"<regex>\")\n- C++11\n  [\\<system\\_error\\>](https:\/\/cplusplus.com\/reference\/system_error\/ \"<system_error>\")\n- C++11\n  [\\<thread\\>](https:\/\/cplusplus.com\/reference\/thread\/ \"<thread>\")\n- C++11\n  [\\<tuple\\>](https:\/\/cplusplus.com\/reference\/tuple\/ \"<tuple>\")\n- C++11\n  [\\<type\\_traits\\>](https:\/\/cplusplus.com\/reference\/type_traits\/ \"<type_traits>\")\n- C++11\n  [\\<typeindex\\>](https:\/\/cplusplus.com\/reference\/typeindex\/ \"<typeindex>\")\n- C++11\n  [\\<unordered\\_map\\>](https:\/\/cplusplus.com\/reference\/unordered_map\/ \"<unordered_map>\")\n- C++11\n  [\\<unordered\\_set\\>](https:\/\/cplusplus.com\/reference\/unordered_set\/ \"<unordered_set>\")\n\n### **[\\<queue\\>](https:\/\/cplusplus.com\/reference\/queue\/)**\n- [priority\\_queue](https:\/\/cplusplus.com\/reference\/queue\/priority_queue\/ \"priority_queue\")\n- [queue](https:\/\/cplusplus.com\/reference\/queue\/queue\/ \"queue\")\n\n### **[queue](https:\/\/cplusplus.com\/reference\/queue\/queue\/)**\n- [queue::queue](https:\/\/cplusplus.com\/reference\/queue\/queue\/queue\/ \"queue::queue\")\n- #### member functions\n  - [queue::back](https:\/\/cplusplus.com\/reference\/queue\/queue\/back\/ \"queue::back\")\n  - C++11\n    [queue::emplace](https:\/\/cplusplus.com\/reference\/queue\/queue\/emplace\/ \"queue::emplace\")\n  - [queue::empty](https:\/\/cplusplus.com\/reference\/queue\/queue\/empty\/ \"queue::empty\")\n  - [queue::front](https:\/\/cplusplus.com\/reference\/queue\/queue\/front\/ \"queue::front\")\n  - [queue::pop](https:\/\/cplusplus.com\/reference\/queue\/queue\/pop\/ \"queue::pop\")\n  - [queue::push](https:\/\/cplusplus.com\/reference\/queue\/queue\/push\/ \"queue::push\")\n  - [queue::size](https:\/\/cplusplus.com\/reference\/queue\/queue\/size\/ \"queue::size\")\n  - C++11\n    [queue::swap](https:\/\/cplusplus.com\/reference\/queue\/queue\/swap\/ \"queue::swap\")\n- #### non-member overloads\n  - [relational operators (queue)](https:\/\/cplusplus.com\/reference\/queue\/queue\/operators\/ \"relational operators (queue)\")\n  - C++11\n    [swap (queue)](https:\/\/cplusplus.com\/reference\/queue\/queue\/swap-free\/ \"swap (queue)\")\n- #### non-member specializations\n  - C++11\n    [uses\\_allocator\\<queue\\>](https:\/\/cplusplus.com\/reference\/queue\/queue\/uses_allocator\/ \"uses_allocator<queue>\")\n\n- C++11\n  [queue::emplace](https:\/\/cplusplus.com\/reference\/queue\/queue\/emplace\/ \"queue::emplace\")\n- C++11\n  [queue::swap](https:\/\/cplusplus.com\/reference\/queue\/queue\/swap\/ \"queue::swap\")\n- C++11\n  [swap (queue)](https:\/\/cplusplus.com\/reference\/queue\/queue\/swap-free\/ \"swap (queue)\")\n- C++11\n  [uses\\_allocator\\<queue\\>](https:\/\/cplusplus.com\/reference\/queue\/queue\/uses_allocator\/ \"uses_allocator<queue>\")\n- [queue::back](https:\/\/cplusplus.com\/reference\/queue\/queue\/back\/ \"queue::back\")\n- [queue::empty](https:\/\/cplusplus.com\/reference\/queue\/queue\/empty\/ \"queue::empty\")\n- [queue::front](https:\/\/cplusplus.com\/reference\/queue\/queue\/front\/ \"queue::front\")\n- [queue::pop](https:\/\/cplusplus.com\/reference\/queue\/queue\/pop\/ \"queue::pop\")\n- [queue::push](https:\/\/cplusplus.com\/reference\/queue\/queue\/push\/ \"queue::push\")\n- [queue::queue](https:\/\/cplusplus.com\/reference\/queue\/queue\/queue\/ \"queue::queue\")\n- [queue::size](https:\/\/cplusplus.com\/reference\/queue\/queue\/size\/ \"queue::size\")\n- [relational operators (queue)](https:\/\/cplusplus.com\/reference\/queue\/queue\/operators\/ \"relational operators (queue)\")\n\n- [Reference](https:\/\/cplusplus.com\/reference\/)\n- [\\<queue\\>](https:\/\/cplusplus.com\/reference\/queue\/)\n- [queue](https:\/\/cplusplus.com\/reference\/queue\/queue\/)\n- size\n\npublic member function\n\n\\<queue\\>\n\n# std::[queue](https:\/\/cplusplus.com\/reference\/queue\/queue\/)::size\n```\nsize_type size() const;\n```\nReturn size\n\nReturns the number of elements in the\n\n[queue](https:\/\/cplusplus.com\/queue)\n\n.  \n   \n This member function effectively calls member\n\n[size](https:\/\/cplusplus.com\/deque::size)\n\nof the underlying container object.\n\n### Parameters\nnone\n\n### Return Value\nThe number of elements in the *underlying container*.  \n   \n Member type\n\nsize\\_type\n\nis an unsigned integral type.\n\n### Example\n[Edit & run on cpp.sh](https:\/\/cplusplus.com\/reference\/queue\/queue\/size\/ \"Open C++ Shell (in a new window)\")\n\nOutput:\n\n### Complexity\nConstant (calling\n\n[size](https:\/\/cplusplus.com\/deque::size)\n\non the *underlying container*).\n\n### Data races\nThe container is accessed.\n\n### Exception safety\nProvides the same level of guarantees as the operation performed on the container (no-throw guarantee for standard container types).\n\n### See also\n[**queue::empty**](https:\/\/cplusplus.com\/reference\/queue\/queue\/empty\/)\n\nTest whether container is empty (public member function)\n\n[Home page](https:\/\/cplusplus.com\/) \\| [Privacy policy](https:\/\/cplusplus.com\/privacy.do)  \n© cplusplus.com, 2000-2025 - All rights reserved - *v3.3.4s*   \n[Spotted an error? contact us](https:\/\/cplusplus.com\/contact.do?referrer=%2Freference%2Fqueue%2Fqueue%2Fsize%2F)","attrs_readable_markdown":null,"meta_canonical":null}

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Boilerpipe Text	public member function <queue> std:: queue ::size size_type size() const; Return size Returns the number of elements in the queue . This member function effectively calls member size of the underlying container object. Parameters none Return Value The number of elements in the underlying container . Member type size_type is an unsigned integral type. Example 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 // queue::size #include <iostream> // std::cout #include <queue> // std::queue int main () { std::queue< int > myints; std::cout << "0. size: " << myints.size() << '\n' ; for ( int i=0; i<5; i++) myints.push(i); std::cout << "1. size: " << myints.size() << '\n' ; myints.pop(); std::cout << "2. size: " << myints.size() << '\n' ; return 0; } Output: 0. size: 0 1. size: 5 2. size: 4 Complexity Constant (calling size on the underlying container ). Data races The container is accessed. Exception safety Provides the same level of guarantees as the operation performed on the container (no-throw guarantee for standard container types). See also queue::empty Test whether container is empty (public member function)
Markdown	[cplusplus .com](https://cplusplus.com/) - [TUTORIALS](https://cplusplus.com/doc/) - [REFERENCE](https://cplusplus.com/reference/) - [ARTICLES](https://cplusplus.com/articles/) - [FORUM](https://cplusplus.com/forum/) ![](https://cplusplus.com/img/progress.gif) please wait [try again]() [cancel]() [forgot your password?](https://cplusplus.com/user/access.cgi?w=lostpass) [sign up](https://cplusplus.com/user/access.cgi?w=signup) [log in]() [\[Legacy version\]](https://legacy.cplusplus.com/reference/queue/queue/size/) ### [C++](https://cplusplus.com/) - [Tutorials](https://cplusplus.com/doc/) - [Reference](https://cplusplus.com/reference/) - [Articles](https://cplusplus.com/articles/) - [Forum](https://cplusplus.com/forum/) ### [Reference](https://cplusplus.com/reference/) - #### [C library:](https://cplusplus.com/reference/clibrary/) - [\<cassert\> (assert.h)](https://cplusplus.com/reference/cassert/ "<cassert> (assert.h)") - [\<cctype\> (ctype.h)](https://cplusplus.com/reference/cctype/ "<cctype> (ctype.h)") - [\<cerrno\> (errno.h)](https://cplusplus.com/reference/cerrno/ "<cerrno> (errno.h)") - C++11 [\<cfenv\> (fenv.h)](https://cplusplus.com/reference/cfenv/ "<cfenv> (fenv.h)") - [\<cfloat\> (float.h)](https://cplusplus.com/reference/cfloat/ "<cfloat> (float.h)") - C++11 [\<cinttypes\> (inttypes.h)](https://cplusplus.com/reference/cinttypes/ "<cinttypes> (inttypes.h)") - [\<ciso646\> (iso646.h)](https://cplusplus.com/reference/ciso646/ "<ciso646> (iso646.h)") - [\<climits\> (limits.h)](https://cplusplus.com/reference/climits/ "<climits> (limits.h)") - [\<clocale\> (locale.h)](https://cplusplus.com/reference/clocale/ "<clocale> (locale.h)") - [\<cmath\> (math.h)](https://cplusplus.com/reference/cmath/ "<cmath> (math.h)") - [\<csetjmp\> (setjmp.h)](https://cplusplus.com/reference/csetjmp/ "<csetjmp> (setjmp.h)") - [\<csignal\> (signal.h)](https://cplusplus.com/reference/csignal/ "<csignal> (signal.h)") - [\<cstdarg\> (stdarg.h)](https://cplusplus.com/reference/cstdarg/ "<cstdarg> (stdarg.h)") - C++11 [\<cstdbool\> (stdbool.h)](https://cplusplus.com/reference/cstdbool/ "<cstdbool> (stdbool.h)") - [\<cstddef\> (stddef.h)](https://cplusplus.com/reference/cstddef/ "<cstddef> (stddef.h)") - C++11 [\<cstdint\> (stdint.h)](https://cplusplus.com/reference/cstdint/ "<cstdint> (stdint.h)") - [\<cstdio\> (stdio.h)](https://cplusplus.com/reference/cstdio/ "<cstdio> (stdio.h)") - [\<cstdlib\> (stdlib.h)](https://cplusplus.com/reference/cstdlib/ "<cstdlib> (stdlib.h)") - [\<cstring\> (string.h)](https://cplusplus.com/reference/cstring/ "<cstring> (string.h)") - C++11 [\<ctgmath\> (tgmath.h)](https://cplusplus.com/reference/ctgmath/ "<ctgmath> (tgmath.h)") - [\<ctime\> (time.h)](https://cplusplus.com/reference/ctime/ "<ctime> (time.h)") - C++11 [\<cuchar\> (uchar.h)](https://cplusplus.com/reference/cuchar/ "<cuchar> (uchar.h)") - [\<cwchar\> (wchar.h)](https://cplusplus.com/reference/cwchar/ "<cwchar> (wchar.h)") - [\<cwctype\> (wctype.h)](https://cplusplus.com/reference/cwctype/ "<cwctype> (wctype.h)") - #### [Containers:](https://cplusplus.com/reference/stl/) - C++11 [\<array\>](https://cplusplus.com/reference/array/ "<array>") - [\<deque\>](https://cplusplus.com/reference/deque/ "<deque>") - C++11 [\<forward\_list\>](https://cplusplus.com/reference/forward_list/ "<forward_list>") - [\<list\>](https://cplusplus.com/reference/list/ "<list>") - [\<map\>](https://cplusplus.com/reference/map/ "<map>") - [\<queue\>](https://cplusplus.com/reference/queue/ "<queue>") - [\<set\>](https://cplusplus.com/reference/set/ "<set>") - [\<stack\>](https://cplusplus.com/reference/stack/ "<stack>") - C++11 [\<unordered\_map\>](https://cplusplus.com/reference/unordered_map/ "<unordered_map>") - C++11 [\<unordered\_set\>](https://cplusplus.com/reference/unordered_set/ "<unordered_set>") - [\<vector\>](https://cplusplus.com/reference/vector/ "<vector>") - #### [Input/Output:](https://cplusplus.com/reference/iolibrary/) - [\<fstream\>](https://cplusplus.com/reference/fstream/ "<fstream>") - [\<iomanip\>](https://cplusplus.com/reference/iomanip/ "<iomanip>") - [\<ios\>](https://cplusplus.com/reference/ios/ "<ios>") - [\<iosfwd\>](https://cplusplus.com/reference/iosfwd/ "<iosfwd>") - [\<iostream\>](https://cplusplus.com/reference/iostream/ "<iostream>") - [\<istream\>](https://cplusplus.com/reference/istream/ "<istream>") - [\<ostream\>](https://cplusplus.com/reference/ostream/ "<ostream>") - [\<sstream\>](https://cplusplus.com/reference/sstream/ "<sstream>") - [\<streambuf\>](https://cplusplus.com/reference/streambuf/ "<streambuf>") - #### [Multi-threading:](https://cplusplus.com/reference/multithreading/) - C++11 [\<atomic\>](https://cplusplus.com/reference/atomic/ "<atomic>") - C++11 [\<condition\_variable\>](https://cplusplus.com/reference/condition_variable/ "<condition_variable>") - C++11 [\<future\>](https://cplusplus.com/reference/future/ "<future>") - C++11 [\<mutex\>](https://cplusplus.com/reference/mutex/ "<mutex>") - C++11 [\<thread\>](https://cplusplus.com/reference/thread/ "<thread>") - #### [Other:](https://cplusplus.com/reference/std/) - [\<algorithm\>](https://cplusplus.com/reference/algorithm/ "<algorithm>") - [\<bitset\>](https://cplusplus.com/reference/bitset/ "<bitset>") - C++11 [\<chrono\>](https://cplusplus.com/reference/chrono/ "<chrono>") - C++11 [\<codecvt\>](https://cplusplus.com/reference/codecvt/ "<codecvt>") - [\<complex\>](https://cplusplus.com/reference/complex/ "<complex>") - [\<exception\>](https://cplusplus.com/reference/exception/ "<exception>") - [\<functional\>](https://cplusplus.com/reference/functional/ "<functional>") - C++11 [\<initializer\_list\>](https://cplusplus.com/reference/initializer_list/ "<initializer_list>") - [\<iterator\>](https://cplusplus.com/reference/iterator/ "<iterator>") - [\<limits\>](https://cplusplus.com/reference/limits/ "<limits>") - [\<locale\>](https://cplusplus.com/reference/locale/ "<locale>") - [\<memory\>](https://cplusplus.com/reference/memory/ "<memory>") - [\<new\>](https://cplusplus.com/reference/new/ "<new>") - [\<numeric\>](https://cplusplus.com/reference/numeric/ "<numeric>") - C++11 [\<random\>](https://cplusplus.com/reference/random/ "<random>") - C++11 [\<ratio\>](https://cplusplus.com/reference/ratio/ "<ratio>") - C++11 [\<regex\>](https://cplusplus.com/reference/regex/ "<regex>") - [\<stdexcept\>](https://cplusplus.com/reference/stdexcept/ "<stdexcept>") - [\<string\>](https://cplusplus.com/reference/string/ "<string>") - C++11 [\<system\_error\>](https://cplusplus.com/reference/system_error/ "<system_error>") - C++11 [\<tuple\>](https://cplusplus.com/reference/tuple/ "<tuple>") - C++11 [\<type\_traits\>](https://cplusplus.com/reference/type_traits/ "<type_traits>") - C++11 [\<typeindex\>](https://cplusplus.com/reference/typeindex/ "<typeindex>") - [\<typeinfo\>](https://cplusplus.com/reference/typeinfo/ "<typeinfo>") - [\<utility\>](https://cplusplus.com/reference/utility/ "<utility>") - [\<valarray\>](https://cplusplus.com/reference/valarray/ "<valarray>") - [\<algorithm\>](https://cplusplus.com/reference/algorithm/ "<algorithm>") - [\<bitset\>](https://cplusplus.com/reference/bitset/ "<bitset>") - [\<cassert\> (assert.h)](https://cplusplus.com/reference/cassert/ "<cassert> (assert.h)") - [\<cctype\> (ctype.h)](https://cplusplus.com/reference/cctype/ "<cctype> (ctype.h)") - [\<cerrno\> (errno.h)](https://cplusplus.com/reference/cerrno/ "<cerrno> (errno.h)") - [\<cfloat\> (float.h)](https://cplusplus.com/reference/cfloat/ "<cfloat> (float.h)") - [\<ciso646\> (iso646.h)](https://cplusplus.com/reference/ciso646/ "<ciso646> (iso646.h)") - [\<climits\> (limits.h)](https://cplusplus.com/reference/climits/ "<climits> (limits.h)") - [\<clocale\> (locale.h)](https://cplusplus.com/reference/clocale/ "<clocale> (locale.h)") - [\<cmath\> (math.h)](https://cplusplus.com/reference/cmath/ "<cmath> (math.h)") - [\<complex\>](https://cplusplus.com/reference/complex/ "<complex>") - [\<csetjmp\> (setjmp.h)](https://cplusplus.com/reference/csetjmp/ "<csetjmp> (setjmp.h)") - [\<csignal\> (signal.h)](https://cplusplus.com/reference/csignal/ "<csignal> (signal.h)") - [\<cstdarg\> (stdarg.h)](https://cplusplus.com/reference/cstdarg/ "<cstdarg> (stdarg.h)") - [\<cstddef\> (stddef.h)](https://cplusplus.com/reference/cstddef/ "<cstddef> (stddef.h)") - [\<cstdio\> (stdio.h)](https://cplusplus.com/reference/cstdio/ "<cstdio> (stdio.h)") - [\<cstdlib\> (stdlib.h)](https://cplusplus.com/reference/cstdlib/ "<cstdlib> (stdlib.h)") - [\<cstring\> (string.h)](https://cplusplus.com/reference/cstring/ "<cstring> (string.h)") - [\<ctime\> (time.h)](https://cplusplus.com/reference/ctime/ "<ctime> (time.h)") - [\<cwchar\> (wchar.h)](https://cplusplus.com/reference/cwchar/ "<cwchar> (wchar.h)") - [\<cwctype\> (wctype.h)](https://cplusplus.com/reference/cwctype/ "<cwctype> (wctype.h)") - [\<deque\>](https://cplusplus.com/reference/deque/ "<deque>") - [\<exception\>](https://cplusplus.com/reference/exception/ "<exception>") - [\<fstream\>](https://cplusplus.com/reference/fstream/ "<fstream>") - [\<functional\>](https://cplusplus.com/reference/functional/ "<functional>") - [\<iomanip\>](https://cplusplus.com/reference/iomanip/ "<iomanip>") - [\<ios\>](https://cplusplus.com/reference/ios/ "<ios>") - [\<iosfwd\>](https://cplusplus.com/reference/iosfwd/ "<iosfwd>") - [\<iostream\>](https://cplusplus.com/reference/iostream/ "<iostream>") - [\<istream\>](https://cplusplus.com/reference/istream/ "<istream>") - [\<iterator\>](https://cplusplus.com/reference/iterator/ "<iterator>") - [\<limits\>](https://cplusplus.com/reference/limits/ "<limits>") - [\<list\>](https://cplusplus.com/reference/list/ "<list>") - [\<locale\>](https://cplusplus.com/reference/locale/ "<locale>") - [\<map\>](https://cplusplus.com/reference/map/ "<map>") - [\<memory\>](https://cplusplus.com/reference/memory/ "<memory>") - [\<new\>](https://cplusplus.com/reference/new/ "<new>") - [\<numeric\>](https://cplusplus.com/reference/numeric/ "<numeric>") - [\<ostream\>](https://cplusplus.com/reference/ostream/ "<ostream>") - [\<queue\>](https://cplusplus.com/reference/queue/ "<queue>") - [\<set\>](https://cplusplus.com/reference/set/ "<set>") - [\<sstream\>](https://cplusplus.com/reference/sstream/ "<sstream>") - [\<stack\>](https://cplusplus.com/reference/stack/ "<stack>") - [\<stdexcept\>](https://cplusplus.com/reference/stdexcept/ "<stdexcept>") - [\<streambuf\>](https://cplusplus.com/reference/streambuf/ "<streambuf>") - [\<string\>](https://cplusplus.com/reference/string/ "<string>") - [\<typeinfo\>](https://cplusplus.com/reference/typeinfo/ "<typeinfo>") - [\<utility\>](https://cplusplus.com/reference/utility/ "<utility>") - [\<valarray\>](https://cplusplus.com/reference/valarray/ "<valarray>") - [\<vector\>](https://cplusplus.com/reference/vector/ "<vector>") - C++11 [\<array\>](https://cplusplus.com/reference/array/ "<array>") - C++11 [\<atomic\>](https://cplusplus.com/reference/atomic/ "<atomic>") - C++11 [\<cfenv\> (fenv.h)](https://cplusplus.com/reference/cfenv/ "<cfenv> (fenv.h)") - C++11 [\<chrono\>](https://cplusplus.com/reference/chrono/ "<chrono>") - C++11 [\<cinttypes\> (inttypes.h)](https://cplusplus.com/reference/cinttypes/ "<cinttypes> (inttypes.h)") - C++11 [\<codecvt\>](https://cplusplus.com/reference/codecvt/ "<codecvt>") - C++11 [\<condition\_variable\>](https://cplusplus.com/reference/condition_variable/ "<condition_variable>") - C++11 [\<cstdbool\> (stdbool.h)](https://cplusplus.com/reference/cstdbool/ "<cstdbool> (stdbool.h)") - C++11 [\<cstdint\> (stdint.h)](https://cplusplus.com/reference/cstdint/ "<cstdint> (stdint.h)") - C++11 [\<ctgmath\> (tgmath.h)](https://cplusplus.com/reference/ctgmath/ "<ctgmath> (tgmath.h)") - C++11 [\<cuchar\> (uchar.h)](https://cplusplus.com/reference/cuchar/ "<cuchar> (uchar.h)") - C++11 [\<forward\_list\>](https://cplusplus.com/reference/forward_list/ "<forward_list>") - C++11 [\<future\>](https://cplusplus.com/reference/future/ "<future>") - C++11 [\<initializer\_list\>](https://cplusplus.com/reference/initializer_list/ "<initializer_list>") - C++11 [\<mutex\>](https://cplusplus.com/reference/mutex/ "<mutex>") - C++11 [\<random\>](https://cplusplus.com/reference/random/ "<random>") - C++11 [\<ratio\>](https://cplusplus.com/reference/ratio/ "<ratio>") - C++11 [\<regex\>](https://cplusplus.com/reference/regex/ "<regex>") - C++11 [\<system\_error\>](https://cplusplus.com/reference/system_error/ "<system_error>") - C++11 [\<thread\>](https://cplusplus.com/reference/thread/ "<thread>") - C++11 [\<tuple\>](https://cplusplus.com/reference/tuple/ "<tuple>") - C++11 [\<type\_traits\>](https://cplusplus.com/reference/type_traits/ "<type_traits>") - C++11 [\<typeindex\>](https://cplusplus.com/reference/typeindex/ "<typeindex>") - C++11 [\<unordered\_map\>](https://cplusplus.com/reference/unordered_map/ "<unordered_map>") - C++11 [\<unordered\_set\>](https://cplusplus.com/reference/unordered_set/ "<unordered_set>") ### [\<queue\>](https://cplusplus.com/reference/queue/) - [priority\_queue](https://cplusplus.com/reference/queue/priority_queue/ "priority_queue") - [queue](https://cplusplus.com/reference/queue/queue/ "queue") ### [queue](https://cplusplus.com/reference/queue/queue/) - [queue::queue](https://cplusplus.com/reference/queue/queue/queue/ "queue::queue") - #### member functions - [queue::back](https://cplusplus.com/reference/queue/queue/back/ "queue::back") - C++11 [queue::emplace](https://cplusplus.com/reference/queue/queue/emplace/ "queue::emplace") - [queue::empty](https://cplusplus.com/reference/queue/queue/empty/ "queue::empty") - [queue::front](https://cplusplus.com/reference/queue/queue/front/ "queue::front") - [queue::pop](https://cplusplus.com/reference/queue/queue/pop/ "queue::pop") - [queue::push](https://cplusplus.com/reference/queue/queue/push/ "queue::push") - [queue::size](https://cplusplus.com/reference/queue/queue/size/ "queue::size") - C++11 [queue::swap](https://cplusplus.com/reference/queue/queue/swap/ "queue::swap") - #### non-member overloads - [relational operators (queue)](https://cplusplus.com/reference/queue/queue/operators/ "relational operators (queue)") - C++11 [swap (queue)](https://cplusplus.com/reference/queue/queue/swap-free/ "swap (queue)") - #### non-member specializations - C++11 [uses\_allocator\<queue\>](https://cplusplus.com/reference/queue/queue/uses_allocator/ "uses_allocator<queue>") - C++11 [queue::emplace](https://cplusplus.com/reference/queue/queue/emplace/ "queue::emplace") - C++11 [queue::swap](https://cplusplus.com/reference/queue/queue/swap/ "queue::swap") - C++11 [swap (queue)](https://cplusplus.com/reference/queue/queue/swap-free/ "swap (queue)") - C++11 [uses\_allocator\<queue\>](https://cplusplus.com/reference/queue/queue/uses_allocator/ "uses_allocator<queue>") - [queue::back](https://cplusplus.com/reference/queue/queue/back/ "queue::back") - [queue::empty](https://cplusplus.com/reference/queue/queue/empty/ "queue::empty") - [queue::front](https://cplusplus.com/reference/queue/queue/front/ "queue::front") - [queue::pop](https://cplusplus.com/reference/queue/queue/pop/ "queue::pop") - [queue::push](https://cplusplus.com/reference/queue/queue/push/ "queue::push") - [queue::queue](https://cplusplus.com/reference/queue/queue/queue/ "queue::queue") - [queue::size](https://cplusplus.com/reference/queue/queue/size/ "queue::size") - [relational operators (queue)](https://cplusplus.com/reference/queue/queue/operators/ "relational operators (queue)") - [Reference](https://cplusplus.com/reference/) - [\<queue\>](https://cplusplus.com/reference/queue/) - [queue](https://cplusplus.com/reference/queue/queue/) - size public member function \<queue\> # std::[queue](https://cplusplus.com/reference/queue/queue/)::size ``` size_type size() const; ``` Return size Returns the number of elements in the [queue](https://cplusplus.com/queue) . This member function effectively calls member [size](https://cplusplus.com/deque::size) of the underlying container object. ### Parameters none ### Return Value The number of elements in the underlying container. Member type size\_type is an unsigned integral type. ### Example [Edit & run on cpp.sh](https://cplusplus.com/reference/queue/queue/size/ "Open C++ Shell (in a new window)") Output: ### Complexity Constant (calling [size](https://cplusplus.com/deque::size) on the underlying container). ### Data races The container is accessed. ### Exception safety Provides the same level of guarantees as the operation performed on the container (no-throw guarantee for standard container types). ### See also [queue::empty](https://cplusplus.com/reference/queue/queue/empty/) Test whether container is empty (public member function) [Home page](https://cplusplus.com/) \\| [Privacy policy](https://cplusplus.com/privacy.do) © cplusplus.com, 2000-2025 - All rights reserved - v3.3.4s [Spotted an error? contact us](https://cplusplus.com/contact.do?referrer=%2Freference%2Fqueue%2Fqueue%2Fsize%2F)
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