std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>::size
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std::flat_map
flat_map::size
size_type size() const noexcept;
(since C++23)
Returns the number of elements in the container adaptor. Equivalent to: return c .keys.size().
[edit] Parameters
(none)
[edit] Return value
The number of elements in the container adaptor.
[edit] Complexity
Constant.
[edit] Example
Run this code
#include <cassert> #include <flat_map> int main() { std::flat_map <int, char> nums{{1, 'a'}, {1, 'b'}, {2, 'c'}, {2, 'd'}}; assert (nums.size() == 2); }