# std::complex<T>::operator+=,-=,*=,/=

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< cpp‎ | numeric‎ | complex

primary template complex<T> |  |
| (1) |
complex& operator+=(const T& other); |  | (until C++20)
constexpr complex& operator+=(const T& other); |  | (since C++20)
| (2) |
complex& operator-=(const T& other); |  | (until C++20)
constexpr complex& operator-=(const T& other); |  | (since C++20)
| (3) |
complex& operator*=(const T& other); |  | (until C++20)
constexpr complex& operator*=(const T& other); |  | (since C++20)
| (4) |
complex& operator/=(const T& other); |  | (until C++20)
constexpr complex& operator/=(const T& other); |  | (since C++20)
specialization complex<float> |  |
| (1) |
complex& operator+=(float other); |  | (until C++20)
constexpr complex& operator+=(float other); |  | (since C++20)
| (2) |
complex& operator-=(float other); |  | (until C++20)
constexpr complex& operator-=(float other); |  | (since C++20)
| (3) |
complex& operator*=(float other); |  | (until C++20)
constexpr complex& operator*=(float other); |  | (since C++20)
| (4) |
complex& operator/=(float other); |  | (until C++20)
constexpr complex& operator/=(float other); |  | (since C++20)
specialization complex<double> |  |
| (1) |
complex& operator+=(double other); |  | (until C++20)
constexpr complex& operator+=(double other); |  | (since C++20)
| (2) |
complex& operator-=(double other); |  | (until C++20)
constexpr complex& operator-=(double other); |  | (since C++20)
| (3) |
complex& operator*=(double other); |  | (until C++20)
constexpr complex& operator*=(double other); |  | (since C++20)
| (4) |
complex& operator/=(double other); |  | (until C++20)
constexpr complex& operator/=(double other); |  | (since C++20)
specialization complex<long double> |  |
| (1) |
complex& operator+=(long double other); |  | (until C++20)
constexpr complex& operator+=(long double other); |  | (since C++20)
| (2) |
complex& operator-=(long double other); |  | (until C++20)
constexpr complex& operator-=(long double other); |  | (since C++20)
| (3) |
complex& operator*=(long double other); |  | (until C++20)
constexpr complex& operator*=(long double other); |  | (since C++20)
| (4) |
complex& operator/=(long double other); |  | (until C++20)
constexpr complex& operator/=(long double other); |  | (since C++20)
all specializations |  |
| (5) |
template<class X> complex& operator+=(const std::complex <X>& other); |  | (until C++20)
template<class X> constexpr complex& operator+=(const std::complex <X>& other); |  | (since C++20)
| (6) |
template<class X> complex& operator-=(const std::complex <X>& other); |  | (until C++20)
template<class X> constexpr complex& operator-=(const std::complex <X>& other); |  | (since C++20)
| (7) |
template<class X> complex& operator*=(const std::complex <X>& other); |  | (until C++20)
template<class X> constexpr complex& operator*=(const std::complex <X>& other); |  | (since C++20)
| (8) |
template<class X> complex& operator/=(const std::complex <X>& other); |  | (until C++20)
template<class X> constexpr complex& operator/=(const std::complex <X>& other); |  | (since C++20)

Implements the compound assignment operators for complex arithmetic and for mixed complex/scalar arithmetic. Scalar arguments are treated as complex numbers with the real part equal to the argument and the imaginary part set to zero.

1,5) Adds `other` to *this.
2,6) Subtracts `other` from *this.
3,7) Multiplies *this by `other`.
4,8) Divides *this by `other`.

### Parameters

other | - | a complex or scalar value of matching type (float, double, long double)

### Return value

*this

### See also

operator+operator- | applies unary operators to complex numbers (function template)
operator+operator-operator*operator/ | performs complex number arithmetics on two complex values or a complex and a scalar (function template)

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