informational.cpp
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#ifdef CLI11_SINGLE_FILE
#include "CLI11.hpp"
#else
#include "CLI/CLI.hpp"
#endif
#include <iostream>
int main() {
std::cout << "\nCLI11 information:\n";
std::cout << " C++ standard: ";
#if defined(CLI11_CPP20)
std::cout << 20;
#elif defined(CLI11_CPP17)
std::cout << 17;
#elif defined(CLI11_CPP14)
std::cout << 14;
#else
std::cout << 11;
#endif
std::cout << "\n";
std::cout << " __has_include: ";
#ifdef __has_include
std::cout << "yes\n";
#else
std::cout << "no\n";
#endif
#ifdef CLI11_OPTIONAL
std::cout << " [Available as CLI::optional]";
#else
std::cout << " No optional library found\n";
#endif
#ifdef CLI11_STD_OPTIONAL
std::cout << " std::optional support active\n";
#endif
#ifdef CLI11_EXPERIMENTAL_OPTIONAL
std::cout << " std::experimental::optional support active\n";
#endif
#ifdef CLI11_BOOST_OPTIONAL
std::cout << " boost::optional support active\n";
#endif
std::cout << std::endl;
}