std::complex::operator+(unary), operator-(unary)

	(1)
template< class T > std::complex<T> operator+( const std::complex<T>& val );			(until C++20)
template< class T > constexpr std::complex<T> operator+( const std::complex<T>& val );			(since C++20)
		(2)
template< class T > std::complex<T> operator-( const std::complex<T>& val );				(until C++20)
template< class T > constexpr std::complex<T> operator-( const std::complex<T>& val );				(since C++20)

Implements the analogs of the unary arithmetic operators for complex numbers.

1) Returns the value of its argument

2) Negates the argument

val

-

the complex number argument

1) a copy of the argument, std::complex<T>(val)

2) negated argument, std::complex<T>(-val.real(), -val.imag())

Language
Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library (C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)
Filesystem library (C++17)
Technical Specifications

Common mathematical functions
Special mathematical functions
Floating-point environment (C++11)
Complex numbers
Numeric arrays
Pseudo-random number generation
Compile-time rational arithmetic (C++11)
Numeric algorithms
gcd (C++17)
lcm (C++17)
Generic numeric operations
iota (C++11)
accumulate
inner_product
adjacent_difference
partial_sum
reduce (C++17)
transform_reduce (C++17)
inclusive_scan (C++17)
exclusive_scan (C++17)
transform_inclusive_scan (C++17)
transform_exclusive_scan (C++17)
Bit operations
bit_cast (C++20)
ispow2 (C++20)
ceil2 (C++20)
floor2 (C++20)
log2p1 (C++20)