std::complex::real - cppreference.com (original) (raw)

| primary template std::complex<T> | | | | ------------------------------------------------------------ | | ------------- | | (1) | | | | T real() const; | | (until C++14) | | constexpr T real() const; | | (since C++14) | | (2) | | | | void real( T value ); | | (until C++20) | | constexpr void real( T value ); | | (since C++20) | | specialization std::complex<float> | | | | (1) | | | | float real() const; | | (until C++11) | | constexpr float real() const; | | (since C++11) | | (2) | | | | void real( float value ); | | (until C++20) | | constexpr void real( float value ); | | (since C++20) | | specialization std::complex<double> | | | | (1) | | | | double real() const; | | (until C++11) | | constexpr double real() const; | | (since C++11) | | (2) | | | | void real( double value ); | | (until C++20) | | constexpr void real( double value ); | | (since C++20) | | specialization std::complex<long double> | | | | (1) | | | | long double real() const; | | (until C++11) | | constexpr long double real() const; | | (since C++11) | | (2) | | | | void real( long double value ); | | (until C++20) | | constexpr void real( long double value ); | | (since C++20) |

Accesses the real part of the complex number.

  1. Returns the real part.

  2. Sets the real part to value.

[edit] Parameters

value - the value to set the real part to

[edit] Return value

  1. The real part of *this.

  2. (none)

[edit] Notes

In C++11, overload (1) in std::complex specializations used to be specified without const qualifier. However, in C++11, a constexpr specifier used in a non-static member function implies const, and thus the behavior is as if const is specified.

[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 387 C++98 the real part could not be set directly can be set directly via a new real overload

[edit] See also

| | returns the real part (function template) [edit] | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | accesses the imaginary part of the complex number (public member function) [edit] |