std::return_temporary_buffer - cppreference.com (original) (raw)

| | | | | ------------------------------------------------------------- | | ---------------------------------------- | | template< class T > void return_temporary_buffer( T* p ); | | (deprecated in C++17) (removed in C++20) |

Deallocates the storage referenced by p.

If p is not a pointer value returned by an earlier call to std::get_temporary_buffer, or has been invalidated by an intervening std::return_temporary_buffer call, the behavior is undefined.

[edit] Parameters

p	-	the pointer referring to the storage to be declloated

[edit] Return value

(none)

[edit] Exceptions

Throws nothing.

[edit] Example

#include #include #include #include #include int main() { const std::string s[] = {"string", "1", "test", "..."}; const auto p = std::get_temporary_buffer<std::string>(4); // requires that p.first is passed to return_temporary_buffer // (beware of early exit points and exceptions), or better use: std::unique_ptr<std::string, void()(std::string*)> on_exit(p.first, p) { std::cout << "returning temporary buffer...\n"; std::return_temporary_buffer(p); }); std::copy(s, s + p.second, std::raw_storage_iterator<std::string*, std::string>(p.first)); // has same effect as: std::uninitialized_copy(s, s + p.second, p.first); // requires that each string in p is individually destroyed // (beware of early exit points and exceptions) std::copy(p.first, p.first + p.second, std::ostream_iterator<std::string>{std::cout, "\n"}); std::for_each(p.first, p.first + p.second, & e) { e.~basic_string(); }); // same as: std::destroy(p.first, p.first + p.second); // manually reclaim memory if unique_ptr-like technique is not used: // std::return_temporary_buffer(p.first); }

Output:

string 1 test ... returning temporary buffer...

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.