Error.hpp

#pragma once
 
#include <fmt/format.h>
#include <fmt/std.h>
 
#include <string>
#include <utility>
 
// for the static_assert at the bottom which fixes clang compilation:
// see: https://godbolt.org/z/fzTjMd7G1 vs https://godbolt.org/z/jhKG7deen
#include <any>
#include <expected>
 
namespace util::async {

struct ExecutionError {
    ExecutionError(std::string tid, std::string msg)
        : message{fmt::format("Thread {} exit with exception: {}", std::move(tid), std::move(msg))}
    {
    }
 
    ExecutionError(ExecutionError const&) = default;
    ExecutionError(ExecutionError&&) = default;
    ExecutionError&
    operator=(ExecutionError&&) = default;
    ExecutionError&
    operator=(ExecutionError const&) = default;

    [[nodiscard]]
    operator char const*() const noexcept
    {
        return message.c_str();
    }
 
    std::string message;
};
 
// these are not the droids you are looking for...
static_assert(std::is_copy_constructible_v<std::expected<std::any, ExecutionError>>);
 
}  // namespace util::async