std::flat_set<Key,Compare,KeyContainer>:: insert_range

Inserts a copy of each element in the range rg into underlying container c as if by:

for (const auto& e : rg)
    c.insert(c.end(), e);

Then, sorts the range of newly inserted elements with respect to compare . Merges the resulting sorted range and the sorted range of pre-existing elements into a single sorted range. Finally, erases all but the first element from each group of consecutive equivalent elements.

Each iterator in the range rg is dereferenced exactly once.

If any of the following conditions is satisfied, the behavior is undefined:

• value_type is not EmplaceConstructible into flat_set from * ranges:: begin ( rg )
• rg and * this overlap.

Parameters

Complexity

\(\scriptsize S + N \cdot \log(N)\) S+N·log(N) , where \(\scriptsize S\) S is size ( ) and \(\scriptsize N\) N is ranges:: distance ( rg ) .

Notes

Since insert_range performs an in-place merge operation, that may allocate memory.

Example

#include <iostream>
#include <flat_set>
void println(auto, const auto& container)
{
    for (const auto& elem : container)
        std::cout << elem << ' ';
    std::cout << '\n';
}
int main()
{
    auto container = std::flat_set{1, 3, 2, 4};
    const auto rg = {-1, 3, -2};
#ifdef __cpp_lib_containers_ranges
    container.insert_range(rg);
#else
    container.insert(rg.begin(), rg.end());
#endif
    println("{}", container);
}

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See also