std::negate
From cppreference.com
< cpp | utility | functional
| Defined in header <functional>
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| 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
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The standard library provides a specialization of
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(since C++14) |
Member types
| Type | Definition |
result_type (deprecated in C++17)(removed in C++20)
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T
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argument_type (deprecated in C++17)(removed in C++20)
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T
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These member types are obtained via publicly inheriting std::unary_function<T, T>. |
(until C++11) |
Member functions
| operator() |
returns the negation of the argument (public member function) |
std::negate::operator()
T operator()( const T& arg ) const; |
(constexpr since C++14) | |
Returns the negation of arg.
Parameters
| arg | - | value to compute negation of |
Return value
The result of -arg.
Exceptions
May throw implementation-defined exceptions.
Possible implementation
constexpr T operator()(const T& arg) const { return -arg; } |