Created
July 15, 2022 08:15
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use boost::outcome as an alternative to std::expected
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| // https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0323r11.html | |
| // https://en.cppreference.com/w/cpp/header/expected | |
| // https://www.boost.org/doc/libs/master/libs/outcome/doc/html/index.html | |
| // https://github.com/TartanLlama/expected | |
| #include <boost/outcome.hpp> | |
| template <typename T> | |
| using expected = boost::outcome_v2::result<T, std::exception_ptr>; | |
| template <typename Exception> | |
| std::exception_ptr makeUnexpected(const Exception& e) | |
| { | |
| return std::make_exception_ptr(e); | |
| } | |
| expected<int> Test(bool cond) | |
| { | |
| if (cond) | |
| return 1; | |
| else | |
| return makeUnexpected(std::runtime_error("test error")); | |
| // return std::make_exception_ptr(std::runtime_error("test error")); | |
| } | |
| int main(int argc, char *argv[]) | |
| { | |
| try { | |
| auto result1 = Test(true); | |
| std::cout << "has error: " << result1.has_error() << std::endl; | |
| std::cout << result1.value() << std::endl; | |
| auto result2 = Test(false); | |
| std::cout << "has error: " << result2.has_error() << std::endl; | |
| std::cout << result2.value() << std::endl; | |
| } catch (std::exception& e) { | |
| std::cerr << "Exception: " << e.what() << std::endl; | |
| } | |
| } |
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