template<class T1, class D1, class T2, class D2> bool operator==(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); | (1) | (since C++11) |
template<class T1, class D1, class T2, class D2> bool operator!=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); | (2) | (since C++11) |
template<class T1, class D1, class T2, class D2> bool operator<(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); | (3) | (since C++11) |
template<class T1, class D1, class T2, class D2> bool operator<=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); | (4) | (since C++11) |
template<class T1, class D1, class T2, class D2> bool operator>(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); | (5) | (since C++11) |
template<class T1, class D1, class T2, class D2> bool operator>=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); | (6) | (since C++11) |
template <class T, class D> bool operator==(const unique_ptr<T, D>& x, nullptr_t) noexcept; | (7) | (since C++11) |
template <class T, class D> bool operator==(nullptr_t, const unique_ptr<T, D>& x) noexcept; | (8) | (since C++11) |
template <class T, class D> bool operator!=(const unique_ptr<T, D>& x, nullptr_t) noexcept; | (9) | (since C++11) |
template <class T, class D> bool operator!=(nullptr_t, const unique_ptr<T, D>& x) noexcept; | (10) | (since C++11) |
template <class T, class D> bool operator<(const unique_ptr<T, D>& x, nullptr_t); | (11) | (since C++11) |
template <class T, class D> bool operator<(nullptr_t, const unique_ptr<T, D>& y); | (12) | (since C++11) |
template <class T, class D> bool operator<=(const unique_ptr<T, D>& x, nullptr_t); | (13) | (since C++11) |
template <class T, class D> bool operator<=(nullptr_t, const unique_ptr<T, D>& y); | (14) | (since C++11) |
template <class T, class D> bool operator>(const unique_ptr<T, D>& x, nullptr_t); | (15) | (since C++11) |
template <class T, class D> bool operator>(nullptr_t, const unique_ptr<T, D>& y); | (16) | (since C++11) |
template <class T, class D> bool operator>=(const unique_ptr<T, D>& x, nullptr_t); | (17) | (since C++11) |
template <class T, class D> bool operator>=(nullptr_t, const unique_ptr<T, D>& y); | (18) | (since C++11) |
Compares the pointer values of two unique_ptrs, or a unique_ptr and nullptr.
unique_ptrsunique_ptr and nullptr.| x, y | - | unique_ptrs to compare |
1) x.get() == y.get().
2) x.get() != y.get().
3) std::less<CT>()(x.get(), y.get()), where CT is std::common_type<unique_ptr<T1, D1>::pointer, unique_ptr<T2, D2>::pointer>::type.
4) !(y < x).
5) y < x.
6) !(x < y).
7-8) !x.
9-10) (bool)x.
11) std::less<unique_ptr<T,D>::pointer>()(x.get(), nullptr).
12) std::less<unique_ptr<T,D>::pointer>()(nullptr, y.get()).
13) !(nullptr < x).
14) !(y < nullptr).
15) nullptr < x.
16) y < nullptr.
17) !(x < nullptr).
18) !(nullptr < y).
#include <iostream>
#include <memory>
int main()
{
std::unique_ptr<int> p1(new int(42));
std::unique_ptr<int> p2(new int(42));
std::cout << "p1 == p1: " << (p1 == p1) << '\n';
// p1 and p2 point to different memory locations, so p1 != p2
std::cout << "p1 == p2: " << (p1 == p2) << '\n';
}Output:
p1 == p1: 1 p1 == p2: 0
| returns a pointer to the managed object (public member function) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/memory/unique_ptr/operator_cmp