std::equal_to
Defined in header <functional> | | |
|---|---|---|
template< class T > struct equal_to; | | (until C++14) |
template< class T = void > struct equal_to; | | (since C++14) |
用于执行比较的函数对象。除非是专门的，否则调用operator==论类型T...
专门性
The standard library provides a specialization of std::equal_to when T is not specified, which leaves the parameter types and return type to be deduced. equal_to<void> function object implementing x == y deducing argument and return types (class template specialization) | equal_to<void> | function object implementing x == y deducing argument and return types (class template specialization) | (since C++14) |
|---|---|---|---|
equal_to<void> | function object implementing x == y deducing argument and return types (class template specialization) |
成员类型
type | definition |
|---|---|
result_type(deprecated in C++17) | bool |
first_argument_type(deprecated in C++17) | T |
second_argument_type(deprecated in C++17) | T |
成员函数
operator() | checks if the arguments are equal (public member function) |
|---|
性病：平等[医]致：操作员%28%29
bool operator()( const T& lhs, const T& rhs ) const; | | (until C++14) |
|---|---|---|
constexpr bool operator()( const T& lhs, const T& rhs ) const; | | (since C++14) |
检查是否lhs是平等到rhs...
参数
lhs, rhs | - | values to compare |
|---|
返回值
true如果lhs == rhs，，，false否则。
例外
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可能的实施
ConstT&rhs，constT&rhs%29 const=rhs==rhs；}
*。
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