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ntauth/semantic_cpp_optional.cpp

Last active July 9, 2018 15:34
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Semantic C++: Optionals
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semantic_cpp_optional.cpp
/**
* @author Ayoub Chouak (@ntauth)
* @website http://chouak.me
* @note This requires a C++17-compliant compiler (ex. MSVC14, Clang5)
*/
#include <optional>
#include <iostream>
#include <string>
#include <chrono>
template <typename U>
std::ostream& operator<<(std::ostream& os, std::optional<U> nullable) {
if (nullable.has_value())
os << nullable.value();
return os;
}
int main(int argc, char** argv)
{
std::optional<int> int_n;
std::optional<std::string> string_n;
std::optional<std::string> string_n_{ "I have a value!" };
std::cout << int_n << string_n << string_n_ << std::endl;
std::cin.get();
}
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