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std::flat_multimap::keys(3) C++ Standard Libary std::flat_multimap::keys(3)

NAME

std::flat_multimap::keys - std::flat_multimap::keys

Synopsis


const key_container_type& keys() const noexcept; (since C++23)


Return a constant reference to the adapted keys container. Equivalent to return
c.keys;.

Parameters


(none)

Return value


The underlying keys container.

Complexity


Constant.

Example

// Run this code


#include <flat_map>
#include <print>
#include <type_traits>
#include <vector>


int main()
{
std::flat_multimap<int, double> adaptor{{1, 1.1}, {2, 2.2}, {3, 3.3}};


// The default keys container is std::vector:
static_assert(std::is_same_v<decltype(adaptor.keys()), const std::vector<int>&>);


std::println("{}", adaptor.keys());
}

Output:


[1, 2, 3]

See also


values direct access to the underlying values container
(public member function)

2024.06.10 http://cppreference.com