std::ranges::destroy

Since C++20

Header: <memory>

  1. Destroys the objects in the range [first,last), as if by for (; first != last; ++first) std::ranges::destroy_at(std::addressof(*first)); return first;

# Declarations

Call signature

template< no-throw-input-iterator I, no-throw-sentinel-for<I> S >
requires std::destructible<std::iter_value_t<I>>
constexpr I destroy( I first, S last ) noexcept;

(since C++20)

template< no-throw-input-range R >
requires std::destructible<ranges::range_value_t<R>>
constexpr ranges::borrowed_iterator_t<R> destroy( R&& r ) noexcept;

(since C++20)

# Parameters

# Return value

An iterator compares equal to last.

# Example

#include <iostream>
#include <memory>
#include <new>
 
struct Tracer
{
    int value;
    ~Tracer() { std::cout << value << " destructed\n"; }
};
 
int main()
{
    alignas(Tracer) unsigned char buffer[sizeof(Tracer) * 8];
 
    for (int i = 0; i < 8; ++i)
        new(buffer + sizeof(Tracer) * i) Tracer{i}; //manually construct objects
 
    auto ptr = std::launder(reinterpret_cast<Tracer*>(buffer));
 
    std::ranges::destroy(ptr, ptr + 8);
}

# See also