std::queue<T,Container>::push_range

 

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template< container-compatible-range<value_type> R > void push_range( R&& rg );		(since C++23)

Inserts a copy of each element of rg in queue as if by this->append_range(std::forward<R>(rg)) if that is a valid expression (i.e. the underlying container has an appropriate append_range member function), or by ranges::copy(rg, std::back_inserter(c)) otherwise.

Each iterator in the range rg is dereferenced exactly once.

Parameters

rg

-

a container compatible range, that is, an input_range whose elements are convertible to T.

Return value

(none)

Complexity

Identical to the complexity of c.append_range or ranges::copy(rg, std::back_inserter(c)) (depending on what function is used internally).

Notes

Feature-test macro	Value	Std	Comment
__cpp_lib_containers_ranges	202202L	(C++23)	Ranges-aware construction and insertion

Example

Run this code

#include <algorithm>
#include <iostream>
#include <ranges>
#include <queue>
 
template<typename Adaptor>
requires (std::ranges::input_range<typename Adaptor::container_type>)
void println(auto, const Adaptor& adaptor)
{
    struct Container : Adaptor // gain access to protected Adaptor::Container c;
    {
        auto const& container() const { return this->c; }
    };
 
    for (auto const& elem : static_cast<const Container&>(adaptor).container())
        std::cout << elem << ' ';
    std::cout << '\n';
}
 
int main()
{
    std::queue<int> adaptor;
    const auto rg = {1, 3, 2, 4};
 
#ifdef __cpp_lib_containers_ranges
    adaptor.push_range(rg);
#else
    std::ranges::for_each(rg, [&adaptor](auto e){ adaptor.push(e); });
#endif
 
    println("{}", adaptor);
}

Output:

1 3 2 4

See also

push	inserts element at the end (public member function)