result.hpp

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// Copyright (c) 2025 [caomengxuan666]
 
#pragma once
 
#include <string>
#include <string_view>
#include <tl/expected.hpp>
#include <type_traits>
#include <utility>
#include <variant>
 
 
namespace mcp::core {
 
template <class E>
constexpr auto unexpected(E&& value) {
  return tl::unexpected<std::decay_t<E> >(std::forward<E>(value));
}
 
struct Error {
  int code = 0;
 
  std::string message;
 
  std::string detail;
 
  std::string category;
};
 
using Unit = std::monostate;
 
template <typename T>
using Result = tl::expected<T, Error>;
 
inline bool starts_with(std::string_view value, std::string_view prefix) {
  return value.size() >= prefix.size() &&
         value.substr(0, prefix.size()) == prefix;
}
 
inline bool starts_with(std::string_view value, char prefix) {
  return !value.empty() && value.front() == prefix;
}
 
inline bool ends_with(std::string_view value, std::string_view suffix) {
  return value.size() >= suffix.size() &&
         value.substr(value.size() - suffix.size()) == suffix;
}
 
inline bool ends_with(std::string_view value, char suffix) {
  return !value.empty() && value.back() == suffix;
}
 
}  // namespace mcp::core