diff options
Diffstat (limited to 'libstdc++-v3/include/bits/stl_map.h')
-rw-r--r-- | libstdc++-v3/include/bits/stl_map.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/libstdc++-v3/include/bits/stl_map.h b/libstdc++-v3/include/bits/stl_map.h index b81a2c4b7fc..fdd058b060d 100644 --- a/libstdc++-v3/include/bits/stl_map.h +++ b/libstdc++-v3/include/bits/stl_map.h @@ -1223,6 +1223,25 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER #endif //@} +#if __cplusplus > 201703L + //@{ + /** + * @brief Finds whether an element with the given key exists. + * @param __x Key of (key, value) pairs to be located. + * @return True if there is an element with the specified key. + */ + bool + contains(const key_type& __x) const + { return _M_t.find(__x) != _M_t.end(); } + + template<typename _Kt> + auto + contains(const _Kt& __x) const + -> decltype(_M_t._M_find_tr(__x), void(), true) + { return _M_t._M_find_tr(__x) != _M_t.end(); } + //@} +#endif + //@{ /** * @brief Finds the beginning of a subsequence matching given key. |