/*
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@file
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Defines `boost::hana::experimental::type_name`.
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@copyright Louis Dionne 2013-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_EXPERIMENTAL_TYPE_NAME_HPP
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#define BOOST_HANA_EXPERIMENTAL_TYPE_NAME_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/string.hpp>
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#include <cstddef>
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#include <utility>
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BOOST_HANA_NAMESPACE_BEGIN namespace experimental {
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namespace detail {
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struct cstring {
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char const* ptr;
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std::size_t length;
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};
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// Note: We substract the null terminator from the string sizes below.
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template <typename T>
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constexpr cstring type_name_impl2() {
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#if defined(__clang__)
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constexpr char const* pretty_function = __PRETTY_FUNCTION__;
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constexpr std::size_t total_size = sizeof(__PRETTY_FUNCTION__) - 1;
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constexpr std::size_t prefix_size = sizeof("boost::hana::experimental::detail::cstring boost::hana::experimental::detail::type_name_impl2() [T = ") - 1;
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constexpr std::size_t suffix_size = sizeof("]") - 1;
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#else
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#error "No support for this compiler."
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#endif
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return {pretty_function + prefix_size, total_size - prefix_size - suffix_size};
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}
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template <typename T, std::size_t ...i>
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auto type_name_impl1(std::index_sequence<i...>) {
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constexpr auto name = detail::type_name_impl2<T>();
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return hana::string<*(name.ptr + i)...>{};
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}
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} // end namespace detail
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//! @ingroup group-experimental
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//! Returns a `hana::string` representing the name of the given type, at
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//! compile-time.
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//!
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//! This only works on Clang (and apparently MSVC, but Hana does not work
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//! there as of writing this). Original idea taken from
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//! https://github.com/Manu343726/ctti.
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template <typename T>
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auto type_name() {
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constexpr auto name = detail::type_name_impl2<T>();
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return detail::type_name_impl1<T>(std::make_index_sequence<name.length>{});
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}
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} BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_EXPERIMENTAL_TYPE_NAME_HPP
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