C++ Tutorial => Standard user-defined literals for complex

Example

C++14

Those following complex user literals are declared in the namespace std::literals::complex_literals, where both literals and complex_literals are inline namespaces. Access to these operators can be gained with using namespace std::literals, using namespace std::complex_literals, and using namespace std::literals::complex_literals.

#include <complex>
#include <iostream>

int main()
{
    using namespace std::literals::complex_literals;
    
    std::complex<double> c = 2.0 + 1i;        // {2.0, 1.}
    std::complex<float> cf = 2.0f + 1if;      // {2.0f, 1.f}
    std::complex<long double> cl = 2.0L + 1il; // {2.0L, 1.L}
    
    std::cout << "abs" << c << " = " << abs(c) << std::endl;   // abs(2,1) = 2.23607
    std::cout << "abs" << cf << " = " << abs(cf) << std::endl; // abs(2,1) = 2.23607
    std::cout << "abs" << cl << " = " << abs(cl) << std::endl; // abs(2,1) = 2.23607
}

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C++ User-Defined Literals Standard user-defined literals for complex

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