std::equal_to
template< class T >
struct equal_to;
| | (until C++14) |
template< class T = void >
struct equal_to;
| | (since C++14) |
Function object for performing comparisons. Unless specialised, invokes operator== on type T.
Specializations
| 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.
| | function object implementing x == y deducing argument and return types
(class template specialization) |
| (since C++14) |
Member types | 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 |
| (until C++20) |
Member functions
| operator() | checks if the arguments are equal
(public member function) |
std::equal_to::operator()
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) |
Checks whether lhs is equal to rhs.
Parameters
| lhs, rhs | - | values to compare |
Return value
true if lhs == rhs, false otherwise.
Exceptions
(none).
Possible implementation
constexpr bool operator()(const T &lhs, const T &rhs) const
{
return lhs == rhs;
} |