typing_utility.hpp

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// Copyright (c) 2023-2025 Jakub Musiał
// This file is part of the CPP-AP project (https://github.com/SpectraL519/cpp-ap).
// Licensed under the MIT License. See the LICENSE file in the project root for full license information.
 
#pragma once
 
#include <functional>
#include <memory>
#include <optional>
#include <source_location>
#include <string_view>
 
namespace ap::detail {
 
template <typename T>
using uptr_opt_t = std::optional<std::reference_wrapper<std::unique_ptr<T>>>;
 
template <typename T>
constexpr std::string_view get_demangled_type_name() {
#if defined(__clang__) || defined(__GNUC__)
    constexpr std::string_view func_name = __PRETTY_FUNCTION__;
    constexpr std::string_view begin_key = "T = ";
    constexpr std::string_view end_key = ";]";
 
    auto start_pos = func_name.find(begin_key) + begin_key.size();
    auto end_pos = func_name.find_first_of(end_key, start_pos);
    return func_name.substr(start_pos, end_pos - start_pos);
#elif defined(_MSC_VER)
    constexpr std::string_view func_name = __FUNCSIG__;
    constexpr std::string_view begin_key = "type_name<";
    constexpr char end_key = '>';
 
    auto start_pos = func_name.find(begin_key) + begin_key.size();
    auto end_pos = func_name.find(end_key, start_pos);
    return func_name.substr(start_pos, end_pos - start_pos);
#else
    return typeid(T).name();
#endif
}
 
} // namespace ap::detail