pointer release() noexcept; | (since C++11) (constexpr since C++23) |
Releases the ownership of the managed object, if any.
get() returns nullptr after the call.
The caller is responsible for cleaning up the object (e.g. by use of get_deleter()).
(none).
Pointer to the managed object or nullptr if there was no managed object, i.e. the value which would be returned by get() before the call.
#include <cassert>
#include <iostream>
#include <memory>
struct Foo
{
Foo() { std::cout << "Foo\n"; }
~Foo() { std::cout << "~Foo\n"; }
};
// Ownership of the Foo resource is transferred when calling this function
void legacy_api(Foo* owning_foo)
{
std::cout << __func__ << '\n';
// [legacy code that no one understands or dares touch anymore]
// [...]
delete owning_foo;
}
int main()
{
std::unique_ptr<Foo> managed_foo(new Foo);
// [code that might return or throw or some such]
// [...]
legacy_api(managed_foo.release());
assert(managed_foo == nullptr);
}Output:
Foo legacy_api ~Foo
| returns a pointer to the managed object (public member function) |
|
| returns the deleter that is used for destruction of the managed object (public member function) |
|
| replaces the managed object (public member function) |
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https://en.cppreference.com/w/cpp/memory/unique_ptr/release