std::negate(3) | C++ Standard Libary | std::negate(3) |
NAME¶
std::negate - std::negate
Synopsis¶
Defined in header <functional>
template< class T > (until C++14)
struct negate;
template< class T = void > (since C++14)
struct negate;
Function object for performing negation. Effectively calls operator- on an
instance
of type T.
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.
(since C++14)
negate<void> function object implementing -x deducing parameter and
(C++14) return types
(class template specialization)
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 (until C++11)
std::unary_function<T, 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¶
May throw implementation-defined exceptions.
Possible implementation¶
constexpr T operator()(const T& arg) const
{
return -arg;
}
2024.06.10 | http://cppreference.com |