std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>::replace

Since C++23

Replaces the underlying containers c. Equivalent to:

# Declarations

void replace( key_container_type&& key_cont, mapped_container_type&& mapped_cont );

(since C++23)

# Parameters

keys_cont: a sorted keys container of type KeyContainer, the contents of which will be moved into *this
mapped_cont: a container of mapped values of type MappedContainer, the contents of which will be moved into *this

# Return value

(none)

# Example

#include <algorithm>
#include <cassert>
#include <flat_map>
#include <print>
#include <vector>
 
int main()
{
    std::vector<int> keys{1, 2, 3};
    assert(std::ranges::is_sorted(keys));
    std::vector<double> values{2.2, 3.3, 1.1};
    assert(keys.size() == values.size());
 
    std::flat_map<int, double> map;
    assert(map.empty());
 
    map.replace(keys, values);
    assert(map.size() == 3);
    assert(map.keys() == 3);
    assert(map.values() == 3);
    assert(keys.empty());
    assert(values.empty());
 
    std::println("{}", map);
}

# See also

extract