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https://github.com/ToruNiina/toml11.git
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151 lines
3.5 KiB
C++
151 lines
3.5 KiB
C++
// Copyright Toru Niina 2017.
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// Distributed under the MIT License.
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#ifndef TOML11_UTILITY_HPP
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#define TOML11_UTILITY_HPP
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#include <memory>
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#include <sstream>
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#include <utility>
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#include "traits.hpp"
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#include "version.hpp"
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#if TOML11_CPLUSPLUS_STANDARD_VERSION >= 201402L
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# define TOML11_MARK_AS_DEPRECATED(msg) [[deprecated(msg)]]
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#elif defined(__GNUC__)
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# define TOML11_MARK_AS_DEPRECATED(msg) __attribute__((deprecated(msg)))
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#elif defined(_MSC_VER)
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# define TOML11_MARK_AS_DEPRECATED(msg) __declspec(deprecated(msg))
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#else
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# define TOML11_MARK_AS_DEPRECATED
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#endif
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namespace toml
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{
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#if TOML11_CPLUSPLUS_STANDARD_VERSION >= 201402L
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using std::make_unique;
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#else
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template<typename T, typename ... Ts>
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inline std::unique_ptr<T> make_unique(Ts&& ... args)
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{
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return std::unique_ptr<T>(new T(std::forward<Ts>(args)...));
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}
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#endif // TOML11_CPLUSPLUS_STANDARD_VERSION >= 2014
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namespace detail
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{
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template<typename Container>
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void try_reserve_impl(Container& container, std::size_t N, std::true_type)
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{
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container.reserve(N);
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return;
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}
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template<typename Container>
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void try_reserve_impl(Container&, std::size_t, std::false_type) noexcept
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{
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return;
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}
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} // detail
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template<typename Container>
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void try_reserve(Container& container, std::size_t N)
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{
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if(N <= container.size()) {return;}
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detail::try_reserve_impl(container, N, detail::has_reserve_method<Container>{});
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return;
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}
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namespace detail
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{
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inline std::string concat_to_string_impl(std::ostringstream& oss)
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{
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return oss.str();
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}
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template<typename T, typename ... Ts>
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std::string concat_to_string_impl(std::ostringstream& oss, T&& head, Ts&& ... tail)
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{
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oss << std::forward<T>(head);
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return concat_to_string_impl(oss, std::forward<Ts>(tail) ... );
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}
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} // detail
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template<typename ... Ts>
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std::string concat_to_string(Ts&& ... args)
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{
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std::ostringstream oss;
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oss << std::boolalpha << std::fixed;
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return detail::concat_to_string_impl(oss, std::forward<Ts>(args) ...);
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}
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template<typename T>
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T from_string(const std::string& str, T opt)
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{
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T v(opt);
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std::istringstream iss(str);
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iss >> v;
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return v;
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}
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namespace detail
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{
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#if TOML11_CPLUSPLUS_STANDARD_VERSION >= 201402L
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template<typename T>
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decltype(auto) last_one(T&& tail) noexcept
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{
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return std::forward<T>(tail);
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}
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template<typename T, typename ... Ts>
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decltype(auto) last_one(T&& /*head*/, Ts&& ... tail) noexcept
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{
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return last_one(std::forward<Ts>(tail)...);
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}
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#else // C++11
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// The following code
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// ```cpp
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// 1 | template<typename T, typename ... Ts>
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// 2 | auto last_one(T&& /*head*/, Ts&& ... tail)
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// 3 | -> decltype(last_one(std::forward<Ts>(tail)...))
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// 4 | {
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// 5 | return last_one(std::forward<Ts>(tail)...);
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// 6 | }
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// ```
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// does not work because the function `last_one(...)` is not yet defined at
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// line #3, so `decltype()` cannot deduce the type returned from `last_one`.
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// So we need to determine return type in a different way, like a meta func.
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template<typename T, typename ... Ts>
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struct last_one_in_pack
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{
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using type = typename last_one_in_pack<Ts...>::type;
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};
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template<typename T>
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struct last_one_in_pack<T>
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{
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using type = T;
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};
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template<typename ... Ts>
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using last_one_in_pack_t = typename last_one_in_pack<Ts...>::type;
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template<typename T>
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T&& last_one(T&& tail) noexcept
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{
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return std::forward<T>(tail);
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}
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template<typename T, typename ... Ts>
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enable_if_t<(sizeof...(Ts) > 0), last_one_in_pack_t<Ts&& ...>>
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last_one(T&& /*head*/, Ts&& ... tail)
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{
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return last_one(std::forward<Ts>(tail)...);
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}
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#endif
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} // detail
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}// toml
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#endif // TOML11_UTILITY
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