Difference between revisions of "cpp/numeric/complex/operator="
From cppreference.com
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{{cpp/numeric/complex/title|operator{{=}}}} | {{cpp/numeric/complex/title|operator{{=}}}} | ||
{{cpp/numeric/complex/navbar}} | {{cpp/numeric/complex/navbar}} | ||
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{{dcl h|All specializations}} | {{dcl h|All specializations}} | ||
{{dcl rev multi|num=1|until1=c++20|dcl1= | {{dcl rev multi|num=1|until1=c++20|dcl1= | ||
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{{dcl rev multi|num=3|until1=c++20|dcl1= | {{dcl rev multi|num=3|until1=c++20|dcl1= | ||
complex& operator=( F x ); | complex& operator=( F x ); | ||
| − | |since2=c++20|until2=c++23 | + | |since2=c++20|until2=c++23|dcl2= |
constexpr complex& operator=( F x ); | constexpr complex& operator=( F x ); | ||
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===Notes=== | ===Notes=== | ||
The copy assignment operator is required to be [[cpp/language/copy assignment#Trivial copy assignment operator|trivial]] since C++23, but implementations generally make it trivial in all modes. | The copy assignment operator is required to be [[cpp/language/copy assignment#Trivial copy assignment operator|trivial]] since C++23, but implementations generally make it trivial in all modes. | ||
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===See also=== | ===See also=== | ||
Latest revision as of 20:38, 7 November 2023
| All specializations |
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| (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.
Contents |
[edit] Parameters
| x | - | value to assign |
| cx | - | complex value to assign |
[edit] Return value
*this
[edit] Notes
The copy assignment operator is required to be trivial since C++23, but implementations generally make it trivial in all modes.
[edit] 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 |
[edit] See also
| constructs a complex number (public member function) | |
| a std::complex literal representing purely imaginary number (function) |
