pipe::with describes your initial input value. This can then be piped into objects that provide an operator() member, such as lambdas, using the | operator. Finally, adding | pipe::done signals that the operation is complete, and should be evaluated.
If the piped functors are constexpr-able, then the entire pipeline is constexpr-able.
// example.cpp
#include "pipe.hpp"
#include <iostream>
#include <string>
int print_string(const std::string& msg)
{
std::cout << msg << std::endl;
return 1;
}
int main() {
pipe::with(3)
| [](double v) -> double { return v + 10; }
| [](double v) -> char { return static_cast<char>(v); }
| [](char c) -> std::string { return std::to_string(c); }
| [](const std::string& msg) { return print_string(msg); }
| pipe::done;
}