operator==,!=,<,<=,>,>=(std::unique_ptr)
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< cpp | memory | unique ptr
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template<class T1, class D1, class T2, class D2> bool operator==(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); |
(1) | (C++11 起) |
template<class T1, class D1, class T2, class D2> bool operator!=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); |
(2) | (C++11 起) |
template<class T1, class D1, class T2, class D2> bool operator<(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); |
(3) | (C++11 起) |
template<class T1, class D1, class T2, class D2> bool operator<=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); |
(4) | (C++11 起) |
template<class T1, class D1, class T2, class D2> bool operator>(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); |
(5) | (C++11 起) |
template<class T1, class D1, class T2, class D2> bool operator>=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); |
(6) | (C++11 起) |
template <class T, class D> bool operator==(const unique_ptr<T, D>& x, nullptr_t) noexcept; |
(7) | (C++11 起) |
template <class T, class D> bool operator==(nullptr_t, const unique_ptr<T, D>& x) noexcept; |
(8) | (C++11 起) |
template <class T, class D> bool operator!=(const unique_ptr<T, D>& x, nullptr_t) noexcept; |
(9) | (C++11 起) |
template <class T, class D> bool operator!=(nullptr_t, const unique_ptr<T, D>& x) noexcept; |
(10) | (C++11 起) |
template <class T, class D> bool operator<(const unique_ptr<T, D>& x, nullptr_t); |
(11) | (C++11 起) |
template <class T, class D> bool operator<(nullptr_t, const unique_ptr<T, D>& y); |
(12) | (C++11 起) |
template <class T, class D> bool operator<=(const unique_ptr<T, D>& x, nullptr_t); |
(13) | (C++11 起) |
template <class T, class D> bool operator<=(nullptr_t, const unique_ptr<T, D>& y); |
(14) | (C++11 起) |
template <class T, class D> bool operator>(const unique_ptr<T, D>& x, nullptr_t); |
(15) | (C++11 起) |
template <class T, class D> bool operator>(nullptr_t, const unique_ptr<T, D>& y); |
(16) | (C++11 起) |
template <class T, class D> bool operator>=(const unique_ptr<T, D>& x, nullptr_t); |
(17) | (C++11 起) |
template <class T, class D> bool operator>=(nullptr_t, const unique_ptr<T, D>& y); |
(18) | (C++11 起) |
指针的值进行比较的两个
unique_ptr
s,或unique_ptr
和nullptr.原文:
Compares the pointer values of two
unique_ptr
s, or a unique_ptr
and nullptr.目录 |
[编辑] 参数
x, y | - | unique_ptr s比较 |
[编辑] 返回值
1) x.get() == y.get()
2) x.get() != y.get()
3)std::less<CT>()(x.get(), y.get()),
CT
是std::common_type<unique_ptr<T1, D1>::pointer, unique_ptr<T2, D2>::pointer>::type原文:
std::less<CT>()(x.get(), y.get()), where
CT
is std::common_type<unique_ptr<T1, D1>::pointer, unique_ptr<T2, D2>::pointer>::type4) !(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)
[编辑] 示例
#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'; }
输出:
p1 == p1: 1 p1 == p2: 0
[编辑] 另请参阅
返回一个指针,指向被管理对象 原文: returns a pointer to the managed object (公共成员函数) |