(C++17) | ||||
| Sequence | ||||
(C++11) | ||||
(C++26) | ||||
(C++26) | ||||
(C++11) | ||||
| Associative | ||||
| Unordered associative | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
| Adaptors | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
| Views | ||||
(C++20) | ||||
(C++23) | ||||
| Tables | ||||
| Iterator invalidation | ||||
| Member function table | ||||
| Non-member function table |
size_type size()constnoexcept; | (since C++23) | |
Returns the number of elements in the container adaptor. Equivalent to:return c.keys.size().
Contents |
(none)
The number of elements in the container adaptor.
Constant.
#include <cassert>#include <flat_map> int main(){std::flat_multimap<int,char> nums{{1,'a'},{1,'b'},{2,'c'},{2,'d'}};assert(nums.size()==4);}
| checks whether the container adaptor is empty (public member function)[edit] | |
(C++17)(C++20) | returns the size of a container or array (function template)[edit] |
| returns the maximum possible number of elements (public member function)[edit] |
