Formatting

The interval can be formatted using the stream operator <<

#include <cuinterval/cuinterval.h>
#include <cuinterval/format.h>

#include <iostream>

int main() {
    cu::interval<double> x{1.0, 2.0};
    std::cout << x << "\n"; // [1, 2]
}

or using std::format

#include <cuinterval/cuinterval.h>
#include <cuinterval/format.h>

#include <format>
#include <iostream>

int main() {
    cu::interval<double> x{1.0, 2.0};
    std::cout << std::format("{}", x) << "\n"; // [1, 2]
}

Note

The header <cuinterval/format.h> is not included by default to allow for custom formatting rules.

The output can be customized using format specifiers:

#include <cuinterval/cuinterval.h>
#include <cuinterval/format.h>

#include <format>
#include <iostream>
#include <print> // C++23
int main() {
    cu::interval<double> x{1.0/3.0, 2.0/3.0};
    std::println("{:.3}", x); // [0.333, 0.667]
    std::println("{:.5}", x); // [0.33333, 0.66667]
    std::println("{:.10}", x); // [0.3333333333, 0.6666666667]
}

The format specifier is passed to the underlying floating point type and thus supports all of its specifiers. See cppreference for more information.