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add typed_counter

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bolero-MURAKAMI 2015-05-17 16:01:49 +09:00
parent 4fecb5654c
commit f934939acc
2 changed files with 98 additions and 0 deletions
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1
sprout/stateful.hpp
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@ -14,5 +14,6 @@
#include <sprout/stateful/slot.hpp> #include <sprout/stateful/slot.hpp>
#include <sprout/stateful/typed_id.hpp> #include <sprout/stateful/typed_id.hpp>
#include <sprout/stateful/typed_slot.hpp> #include <sprout/stateful/typed_slot.hpp>
#include <sprout/stateful/typed_counter.hpp>
#endif // #ifndef SPROUT_STATEFUL_HPP #endif // #ifndef SPROUT_STATEFUL_HPP

97
sprout/stateful/typed_counter.hpp Normal file
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@ -0,0 +1,97 @@
/*=============================================================================
Copyright (c) 2011-2015 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_STATEFUL_TYPED_COUNTER_HPP
#define SPROUT_STATEFUL_TYPED_COUNTER_HPP
#include <sprout/config.hpp>
#include <sprout/type_traits/integral_constant.hpp>
namespace sprout {
#ifndef SPROUT_CONFIG_DISABLE_CONSTEXPR
namespace typed_counter_detail {
template<typename T>
struct typed {
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wnon-template-friend"
#endif
#if defined(__clang__)
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wundefined-inline"
#endif
template<int N>
struct tag {
friend SPROUT_CONSTEXPR int adl_counter(tag<N>);
};
#if defined(__clang__)
# pragma clang diagnostic pop
#endif
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic pop
#endif
template<int N>
struct state
: public sprout::integral_constant<int, N>
{
friend SPROUT_CONSTEXPR int adl_counter(tag<N>) {
return N;
}
};
template<int N, int = adl_counter(tag<N>())>
static SPROUT_CONSTEXPR bool check(int, tag<N>) {
return true;
}
template<int N>
static SPROUT_CONSTEXPR bool check(long, tag<N>) {
return false;
}
template<int N>
static SPROUT_CONSTEXPR bool check(bool R = check(0, tag<N>())) {
return R;
}
template<int N>
static SPROUT_CONSTEXPR int counter(sprout::false_type, tag<N>) {
return 0;
}
template<int N>
static SPROUT_CONSTEXPR int counter(
sprout::true_type, tag<N>,
int R = !check<N>() ? N
: counter(sprout::bool_constant<check<N>()>(), tag<N + 1>())
)
{
return R;
}
template<int N = 0>
static SPROUT_CONSTEXPR int counter(int R = counter(sprout::true_type(), tag<N>())) {
return R;
}
};
} // namespace typed_counter_detail
//
// counter
//
template<
typename T,
int N = 1,
int R = sprout::typed_counter_detail::typed<T>::template state<
sprout::typed_counter_detail::typed<T>::template counter(sprout::true_type(), typename sprout::typed_counter_detail::typed<T>::template tag<N - 1>()) + N - 1
>::value
>
SPROUT_CONSTEXPR int counter() {
return R;
}
#endif
} // namespace sprout
#endif // #ifndef SPROUT_STATEFUL_TYPED_COUNTER_HPP