std::negate
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Defined in header
<functional>
template< class T >
struct negate;
(until C++14)
struct negate;
template< class T = void >
struct negate;
(since C++14)
struct negate;
Function object for performing negation. Effectively calls operator- on an instance of type T.
Contents
[edit] Specializations
The standard library provides a specialization of std::negate when T is not specified, which leaves the parameter types and return type to be deduced.
(C++14)
(class template specialization) [edit]
[edit] Member types
Type
Definition
result_type (deprecated in C++17)(removed in C++20)
T
argument_type (deprecated in C++17)(removed in C++20)
T
These member types are obtained via publicly inheriting std::unary_function <T, T>.
(until C++11)[edit] Member functions
operator()
(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.
[edit] Exceptions
May throw implementation-defined exceptions.
Possible implementation
constexpr T operator()(const T& arg) const { return -arg; }