jsonrpc_traits.hpp

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#pragma once
 
#include <concepts>
#include <variant>
 
#include "nlohmann/json.hpp"
 
namespace jsonrpc::endpoint {
 
template <typename T>
concept FromJson = requires(nlohmann::json j) {
  { j.get<T>() } -> std::same_as<T>;
};
 
template <typename T>
concept ToJson = std::is_same_v<T, std::monostate> || requires(T value) {
  { nlohmann::json(value) } -> std::same_as<nlohmann::json>;
};
 
template <typename T>
concept JsonConvertible = FromJson<T> && ToJson<T>;
 
template <typename T>
concept NotJsonLike =
    !std::is_same_v<std::decay_t<T>, nlohmann::json> &&
    !std::is_same_v<std::decay_t<T>, std::optional<nlohmann::json>>;
 
template <typename T>
concept HasMessageMethod = std::is_same_v<T, std::monostate> || requires(T e) {
  { e.Message() } -> std::convertible_to<std::string>;
};
 
}  // namespace jsonrpc::endpoint