###

#

dynamic_at_c.hpp
//
// Copyright 2005-2007 Adobe Systems Incorporated
//
// 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 BOOST_GIL_EXTENSION_DYNAMIC_IMAGE_DYNAMIC_AT_C_HPP
#define BOOST_GIL_EXTENSION_DYNAMIC_IMAGE_DYNAMIC_AT_C_HPP
#include <boost/gil/detail/mp11.hpp>
#include <boost/preprocessor/facilities/empty.hpp>
#include <boost/preprocessor/repetition/repeat.hpp>
#include <stdexcept>
namespace boost { namespace gil {
// Constructs for static-to-dynamic integer convesion
#define BOOST_GIL_AT_C_VALUE(z, N, text) mp11::mp_at_c<IntTypes, S+N>::value,
#define BOOST_GIL_DYNAMIC_AT_C_LIMIT 226 // size of the maximum vector to handle
#define BOOST_GIL_AT_C_LOOKUP(z, NUM, text) \
template<std::size_t S> \
struct at_c_fn<S,NUM> { \
template <typename IntTypes, typename ValueType> inline \
static ValueType apply(std::size_t index) { \
static ValueType table[] = { \
BOOST_PP_REPEAT(NUM, BOOST_GIL_AT_C_VALUE, BOOST_PP_EMPTY) \
}; \
return table[index]; \
} \
};
namespace detail {
namespace at_c {
template <std::size_t START, std::size_t NUM> struct at_c_fn;
BOOST_PP_REPEAT(BOOST_GIL_DYNAMIC_AT_C_LIMIT, BOOST_GIL_AT_C_LOOKUP, BOOST_PP_EMPTY)
template <std::size_t QUOT> struct at_c_impl;
template <>
struct at_c_impl<0> {
template <typename IntTypes, typename ValueType> inline
static ValueType apply(std::size_t index) {
return at_c_fn<0, mp11::mp_size<IntTypes>::value>::template apply<IntTypes,ValueType>(index);
}
};
template <>
struct at_c_impl<1> {
template <typename IntTypes, typename ValueType> inline
static ValueType apply(std::size_t index) {
const std::size_t SIZE = mp11::mp_size<IntTypes>::value;
const std::size_t REM = SIZE % BOOST_GIL_DYNAMIC_AT_C_LIMIT;
switch (index / BOOST_GIL_DYNAMIC_AT_C_LIMIT) {
case 0: return at_c_fn<0 ,BOOST_GIL_DYNAMIC_AT_C_LIMIT-1>::template apply<IntTypes,ValueType>(index);
case 1: return at_c_fn<BOOST_GIL_DYNAMIC_AT_C_LIMIT ,REM >::template apply<IntTypes,ValueType>(index - BOOST_GIL_DYNAMIC_AT_C_LIMIT);
};
throw;
}
};
template <>
struct at_c_impl<2> {
template <typename IntTypes, typename ValueType> inline
static ValueType apply(std::size_t index) {
const std::size_t SIZE = mp11::mp_size<IntTypes>::value;
const std::size_t REM = SIZE % BOOST_GIL_DYNAMIC_AT_C_LIMIT;
switch (index / BOOST_GIL_DYNAMIC_AT_C_LIMIT) {
case 0: return at_c_fn<0 ,BOOST_GIL_DYNAMIC_AT_C_LIMIT-1>::template apply<IntTypes,ValueType>(index);
case 1: return at_c_fn<BOOST_GIL_DYNAMIC_AT_C_LIMIT ,BOOST_GIL_DYNAMIC_AT_C_LIMIT-1>::template apply<IntTypes,ValueType>(index - BOOST_GIL_DYNAMIC_AT_C_LIMIT);
case 2: return at_c_fn<BOOST_GIL_DYNAMIC_AT_C_LIMIT*2,REM >::template apply<IntTypes,ValueType>(index - BOOST_GIL_DYNAMIC_AT_C_LIMIT*2);
};
throw;
}
};
template <>
struct at_c_impl<3> {
template <typename IntTypes, typename ValueType> inline
static ValueType apply(std::size_t index) {
const std::size_t SIZE = mp11::mp_size<IntTypes>::value;
const std::size_t REM = SIZE % BOOST_GIL_DYNAMIC_AT_C_LIMIT;
switch (index / BOOST_GIL_DYNAMIC_AT_C_LIMIT) {
case 0: return at_c_fn<0 ,BOOST_GIL_DYNAMIC_AT_C_LIMIT-1>::template apply<IntTypes,ValueType>(index);
case 1: return at_c_fn<BOOST_GIL_DYNAMIC_AT_C_LIMIT ,BOOST_GIL_DYNAMIC_AT_C_LIMIT-1>::template apply<IntTypes,ValueType>(index - BOOST_GIL_DYNAMIC_AT_C_LIMIT);
case 2: return at_c_fn<BOOST_GIL_DYNAMIC_AT_C_LIMIT*2,BOOST_GIL_DYNAMIC_AT_C_LIMIT-1>::template apply<IntTypes,ValueType>(index - BOOST_GIL_DYNAMIC_AT_C_LIMIT*2);
case 3: return at_c_fn<BOOST_GIL_DYNAMIC_AT_C_LIMIT*3,REM >::template apply<IntTypes,ValueType>(index - BOOST_GIL_DYNAMIC_AT_C_LIMIT*3);
};
throw;
}
};
}
}
template <typename IntTypes, typename ValueType> inline
ValueType at_c(std::size_t index) {
const std::size_t Size=mp11::mp_size<IntTypes>::value;
return detail::at_c::at_c_impl<Size/BOOST_GIL_DYNAMIC_AT_C_LIMIT>::template apply<IntTypes,ValueType>(index);
}
#undef BOOST_GIL_AT_C_VALUE
#undef BOOST_GIL_DYNAMIC_AT_C_LIMIT
#undef BOOST_GIL_AT_C_LOOKUP
}} // namespace boost::gil
#endif
boost
defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)
Definition: algorithm.hpp:36