Defined in header <functional> | ||
---|---|---|
template< class T > struct negate; | (until C++14) | |
template< class T = void > struct negate; | (since C++14) |
Function object for performing negation. Effectively calls operator-
on an instance of type T
.
Specializations
The standard library provides a specialization of
| (since C++14) |
Member types
Type | Definition |
---|---|
result_type | T |
argument_type | T |
Member functions
operator() | returns the negation of the argument (public member function) |
std::negate::operator()
T operator()( const T& arg ) const; | (until C++14) | |
constexpr T operator()( const T& arg ) const; | (since C++14) |
Returns the negation of arg
.
Parameters
arg | - | value to compute negation of |
Return value
The result of -arg
.
Exceptions
(none).
Possible implementation
constexpr T operator()(const T &arg) const { return -arg; } |
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