55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
#include <iostream>
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#include <stdexcept>
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#include <string>
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#include <utility>
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#include <variant>
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namespace ztl{
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template<class ...Ts>
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struct overloaded:Ts...{using Ts::operator()...;};
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template<class ...Ts>
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overloaded(Ts...)->overloaded<Ts...>;
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template<class ...Ts, class ...Fs>
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auto match(std::variant<Ts...>& v, Fs&&... func) {
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return std::visit(ztl::overloaded{std::forward<Fs>(func)...}, v);
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}
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template<class ...Ts, class ...Fs>
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auto match(const std::variant<Ts...>& v, Fs&&... func) {
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return std::visit(ztl::overloaded{std::forward<Fs>(func)...}, v);
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}
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template<class ...Ts, class ...Fs>
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auto match(std::variant<Ts...>&& v, Fs&&... func) {
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return std::visit(ztl::overloaded{std::forward<Fs>(func)...}, std::move(v));
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}
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struct Err:std::string{};
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// template<class T>
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// struct Ok{
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// T data;
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// };
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template<class T>
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struct Result:std::variant<T,Err>{
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T unwrap(){
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return match<T>(*this,[](const T&t){
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return t;
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},[](const Err &e){
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throw std::runtime_error(e);
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T t;
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return t;
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});
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}
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};
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template<class ...Ts>
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void logger(Ts&&...v){
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#ifndef NDEBUG
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std::cout<<"log[";
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(std::cout<<...<<v);
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std::cout<<"]\n";
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#endif
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}
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} |