std::complex<T>::operator=

 

C++

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Feature test macros (C++20)

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Technical specifications

Symbols index

External libraries

 

Numerics library

Common mathematical functions
Mathematical special functions (C++17)
Mathematical constants (C++20)
Basic linear algebra algorithms (C++26)
Floating-point environment (C++11)
Complex numbers
Numeric array (valarray)
Pseudo-random number generation
Factor operations
gcd (C++17)	lcm (C++17)
Interpolations
midpoint (C++20)	lerp (C++20)
Saturation arithmetic
add_sat (C++26) sub_sat (C++26) saturate_cast (C++26)	mul_sat (C++26) div_sat (C++26)
Generic numeric operations
iota (C++11) ranges::iota (C++23) 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
has_single_bit (C++20)     bit_cast (C++20) bit_ceil (C++20) bit_floor (C++20) bit_width (C++20) rotl (C++20) rotr (C++20)	popcount (C++20) countl_zero (C++20) countl_one (C++20) countr_zero (C++20) countr_one (C++20) byteswap (C++23) endian (C++20)

 

std::complex

Member functions
complex::complex complex::operator= complex::real complex::imag	complex::operator+=complex::operator-=complex::operator*=complex::operator/=
Non-member functions
operator+operator- operator+operator-operator*operator/ operator==operator!= (until C++20)   operator<<operator>> get(std::complex) (C++26)	real imag abs arg norm conj proj (C++11) polar operator""ioperator""ifoperator""il (C++14)(C++14)(C++14)
Exponential functions
log   log10   exp
Power functions
pow   sqrt
Trigonometric functions
sin   cos tan asin (C++11) acos (C++11) atan (C++11)
Hyperbolic functions
sinh   cosh tanh asinh (C++11) acosh (C++11) atanh (C++11)
Helper types
tuple_size<std::complex> (C++26)
tuple_element<std::complex> (C++26)

 

All specializations
	(1)
complex& operator=( const complex& cx );			(until C++20)
constexpr complex& operator=( const complex& cx );			(since C++20)
		(2)
template< class X > complex& operator=( const std::complex<X>& cx );				(until C++20)
template< class X > constexpr complex& operator=( const std::complex<X>& cx );				(since C++20)
Primary template complex<T>
			(3)
complex& operator=( const T& x );					(until C++20)
constexpr complex& operator=( const T& x );					(since C++20)
Specializations for standard floating-point types complex<F> (until C++23)
				(3)
complex& operator=( F x );						(until C++20)
constexpr complex& operator=( F x );						(since C++20) (until C++23)

Assigns new values to the contents.

1,2) Assigns cx.real() and cx.imag() to the real and the imaginary parts of the complex number respectively. The copy assignment operator (1) is trivial when T is a floating-point type.(since C++23)

3) Assigns x to the real part of the complex number. Imaginary part is set to zero.

Parameters

x	-	value to assign
cx	-	complex value to assign

Return value

*this

Notes

The copy assignment operator is required to be trivial since C++23, but implementations generally make it trivial in all modes.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 3935	C++98	the description of overload (2) was missing	added

See also

(constructor)	constructs a complex number (public member function)
operator""ifoperator""ioperator""il (C++14)	a std::complex literal representing purely imaginary number (function)