operator<<,>>(std::complex)
From cppreference.com
| Defined in header <complex>
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| template< class T, class CharT, class Traits > std::basic_ostream<CharT, Traits>& |
(1) | |
| template< class T, class CharT, class Traits > std::basic_istream<CharT, Traits>& |
(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)