std::hash<std::unique_ptr>
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template<class T, class Deleter> struct hash<unique_ptr<T, Deleter>>; |
( C++11) | |
std::hash std::unique_ptr<T, Deleter> std::unique_ptr<T, Deleter>.
std::hash<std::unique_ptr<T,D>> ( std::hash), std::hash<typename std::unique_ptr<T,D>::pointer>, .
std::unique_ptr<T, D> p, , std::hash<std::unique_ptr<T, D>>()(p) == std::hash<typename std::unique_ptr<T, D>::pointer>()(p.get()).
, - noexcept, , .
#include <iostream>
#include <memory>
#include <functional>
struct Foo {
Foo(int num) : nr(num) { std::cout << "Foo(" << nr << ")\n"; }
~Foo() { std::cout << "~Foo()\n"; }
bool operator==(const Foo &other) const { return nr == other.nr; };
int nr;
};
int main()
{
std::cout << std::boolalpha << std::hex;
Foo* foo = new Foo(5);
std::unique_ptr<Foo> up(foo);
std::cout << " hash(up): " << std::hash<std::unique_ptr<Foo>>()(up) << '\n';
std::cout << " hash(foo): " << std::hash<Foo*>()(foo) << '\n';
std::cout << " *up==*foo: " << (*up == *foo) << "\n\n";
std::unique_ptr<Foo> other = std::make_unique<Foo>(5);
std::cout << " hash(up): " << std::hash<std::unique_ptr<Foo>>()(up) << '\n';
std::cout << " hash(other): " << std::hash<std::unique_ptr<Foo>>()(other) << '\n';
std::cout << " *up==*other: " <<(*up == *other) << '\n';
}
:
Foo(5)
hash(up): acac20
hash(foo): acac20
*up==*foo: true
Foo(5)
hash(up): acac20
hash(other): acbc50
*up==*other: true
~Foo()
~Foo()
(C++11) |
- ( ) |