operator<<,>>(std::complex)

 

C++

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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)
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log   log10   exp
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pow   sqrt
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sin   cos tan asin (C++11) acos (C++11) atan (C++11)
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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)

 

Defined in header <complex>
template< class T, class CharT, class Traits > std::basic_ostream<CharT, Traits>&     operator<<( std::basic_ostream<CharT, Traits>& os, const std::complex<T>& x );	(1)
template< class T, class CharT, class Traits > std::basic_istream<CharT, Traits>&     operator>>( std::basic_istream<CharT, Traits>& is, std::complex<T>& x );	(2)

1) Writes to os the complex number in the form (real, imaginary).

2) Reads a complex number from is. The supported formats are

• real
• (real)
• (real, imaginary)

where the input for real and imaginary must be convertible to T.

If an error occurs calls is.setstate(ios_base::failbit).

Exceptions

May throw std::ios_base::failure on stream errors.

Parameters

os	-	a character output stream
is	-	a character input stream
x	-	the complex number to be inserted or extracted

Return value

1) os

2) is

Notes

1) As the comma may be used in the current locale as decimal separator, the output may be ambiguous. This can be solved with std::showpoint which forces the decimal separator to be visible.

2) The input is performed as a series of simple formatted extractions. Whitespace skipping is the same for each of them.

Possible implementation

template<class T, class CharT, class Traits> basic_ostream<CharT, Traits>& operator<<(basic_ostream<CharT, Traits>& o, const complex<T>& x) { basic_ostringstream<CharT, Traits> s; s.flags(o.flags()); s.imbue(o.getloc()); s.precision(o.precision()); s << '(' << x.real() << ',' << x.imag() << ')'; return o << s.str(); }

Example

Run this code

#include <complex>
#include <iostream>
 
int main()
{
    std::cout << std::complex<double> {3.14, 2.71} << '\n';
}

Possible output:

(3.14,2.71)