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template <size_t capacity, bool is_signed>
class fixed_int
{
// Описание ошибки компиляции в случае использования не поддерживаемой размерности
template <int x> struct unsupported_capacity { int i[1/(x-x)]; };
template <> struct unsupported_capacity<1> {};
template <> struct unsupported_capacity<2> {};
template <> struct unsupported_capacity<4> {};
template <> struct unsupported_capacity<8> {};
// Свойства базовых типов, необходимые для перебора
template<typename type> struct type_traits;
template<> struct type_traits <unsigned char> { typedef unsigned char current_type; typedef unsigned short next_type; };
template<> struct type_traits <unsigned short> { typedef unsigned short current_type; typedef unsigned int next_type; };
template<> struct type_traits <unsigned int> { typedef unsigned int current_type; typedef unsigned long next_type; };
template<> struct type_traits <unsigned long> { typedef unsigned long current_type; typedef unsigned long long next_type; };
template<> struct type_traits <unsigned long long int> { typedef unsigned long long int current_type; typedef unsupported_capacity<capacity> next_type; };
template<> struct type_traits <signed char> { typedef signed char current_type; typedef short next_type; };
template<> struct type_traits <short> { typedef short current_type; typedef int next_type; };
template<> struct type_traits <int> { typedef int current_type; typedef long next_type; };
template<> struct type_traits <long> { typedef long current_type; typedef long long next_type; };
template<> struct type_traits <long long int> { typedef long long int current_type; typedef unsupported_capacity<capacity> next_type;};
// Алгоритм выбора типа
template<typename type, bool>
struct type_choice
{
typedef typename type_traits<type>::current_type std_type;
};
template<typename type>
struct type_choice<type, false>
{
typedef typename type_traits<type>::next_type next_type;
typedef typename type_choice<next_type, sizeof(next_type) == capacity>::std_type std_type;
};
// Базовый тип для начала подбора
template <bool is_signed> struct base_type_selector { typedef signed char base_type; };
template <> struct base_type_selector<false> { typedef unsigned char base_type; };
public:
typedef typename type_choice< typename base_type_selector<is_signed>::base_type, sizeof(base_type_selector<is_signed>::base_type) == capacity >::std_type type;
};
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