mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2015 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_STATEFUL_COUNTER_HPP
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#define SPROUT_STATEFUL_COUNTER_HPP
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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namespace sprout {
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#ifndef SPROUT_CONFIG_DISABLE_CONSTEXPR
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namespace detail {
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SPROUT_STATIC_CONSTEXPR std::size_t counter_default_call_limit = 128;
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} // namespace detail
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namespace counter_detail {
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#if defined(__GNUC__) && !defined(__clang__)
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wnon-template-friend"
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#endif
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#if defined(__clang__)
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Wundefined-inline"
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#endif
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template<int N>
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struct tag {
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friend SPROUT_CONSTEXPR int adl_counter(sprout::counter_detail::tag<N>);
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};
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#if defined(__clang__)
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# pragma clang diagnostic pop
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#endif
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#if defined(__GNUC__) && !defined(__clang__)
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# pragma GCC diagnostic pop
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#endif
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template<int N>
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struct state {
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friend SPROUT_CONSTEXPR int adl_counter(sprout::counter_detail::tag<N>) {
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return N;
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}
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SPROUT_STATIC_CONSTEXPR int value = N - 1;
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};
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template<int N>
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SPROUT_CONSTEXPR_OR_CONST int sprout::counter_detail::state<N>::value;
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template<>
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struct state<1> {
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friend SPROUT_CONSTEXPR int adl_counter(sprout::counter_detail::tag<1>) {
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return 1;
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}
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static SPROUT_CONSTEXPR int value = 0;
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};
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SPROUT_CONSTEXPR_OR_CONST int sprout::counter_detail::state<1>::value;
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template<int N, int R = adl_counter(sprout::counter_detail::tag<N>())>
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SPROUT_CONSTEXPR int counter(
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int, sprout::counter_detail::tag<N>
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)
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{
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return R;
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}
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SPROUT_CONSTEXPR int counter(
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long, sprout::counter_detail::tag<0>
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)
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{
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return 0;
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}
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template<int N>
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SPROUT_CONSTEXPR int counter(
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long, sprout::counter_detail::tag<N>,
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int R = counter(0, sprout::counter_detail::tag<N - 1>())
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)
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{
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return R;
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}
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} // namespace counter_detail
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//
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// counter
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// counter_before
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//
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template<
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std::size_t Limit = sprout::detail::counter_default_call_limit,
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int R = sprout::counter_detail::state<
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sprout::counter_detail::counter(0, sprout::counter_detail::tag<Limit>()) + 1
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>::value
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>
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SPROUT_CONSTEXPR int counter() {
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return R;
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}
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template<
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std::size_t Limit = sprout::detail::counter_default_call_limit,
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int R = sprout::counter_detail::state<
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sprout::counter_detail::counter(0, sprout::counter_detail::tag<Limit>())
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>::value
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>
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SPROUT_CONSTEXPR int counter_before() {
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return R;
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}
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#endif
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} // namespace sprout
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#endif // #ifndef SPROUT_STATEFUL_COUNTER_HPP
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