| Defined in header <complex> | ||
|---|---|---|
constexpr complex<double> operator""i(long double arg); constexpr complex<double> operator""i(unsigned long long arg); | (1) | (since C++14) |
constexpr complex<float> operator""if(long double arg); constexpr complex<float> operator""if(unsigned long long arg); | (2) | (since C++14) |
constexpr complex<long double> operator""il(long double arg); constexpr complex<long double> operator""il(unsigned long long arg); | (3) | (since C++14) |
Forms a std::complex literal representing an imaginary number.
Parameters
| arg | - | the value of the imaginary number |
Return value
The std::complex literal with the real part zero and imaginary part arg.
Notes
These operators 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.
Even though if is a keyword in C++, it is a ud-suffix of the literal operator of the form operator ""if and in the literal expressions such as 1if or 1.0if because it is not separated by whitespace and is not a standalone token.
Possible implementation
| First version |
|---|
constexpr std::complex<double> operator""i(unsigned long long d)
{
return std::complex<double>{0.0, static_cast<double>(d)};
}
constexpr std::complex<double> operator""i(long double d)
{
return std::complex<double>{0.0, static_cast<double>(d)};
} |
| Second version |
constexpr std::complex<float> operator""if(unsigned long long d)
{
return std::complex<float>{0.0f, static_cast<float>(d)};
}
constexpr std::complex<float> operator""if(long double d)
{
return std::complex<float>{0.0f, static_cast<float>(d)};
} |
| Third version |
constexpr std::complex<long double> operator""il(unsigned long long d)
{
return std::complex<long double>{0.0L, static_cast<long double>(d)};
}
constexpr std::complex<long double> operator""il(long double d)
{
return std::complex<long double>{0.0L, d};
} |
Example
#include <iostream>
#include <complex>
int main()
{
using namespace std::complex_literals;
std::complex<double> c = 1.0 + 1i;
std::cout << "abs" << c << " = " << abs(c) << '\n';
}Output:
abs(1,1) = 1.41421
See also
| constructs a complex number (public member function) | |
| operator=
| assigns the contents (public member function) |
C documentation for I | |
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