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[meta] Add hb_int_max()

This commit is contained in:
Behdad Esfahbod 2019-05-09 11:00:43 -07:00
parent 71537f93e0
commit 05867d9f53
1 changed files with 56 additions and 35 deletions
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91
src/hb-meta.hh
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@ -47,7 +47,7 @@ template<typename... Ts> using hb_head_tt = typename _hb_head_tt<Ts...>::type;
/* Bool! For when we need to evaluate type-dependent expressions
* in a template argument. */
template <bool b> struct hb_bool_tt { enum { value = b }; };
template <bool b> struct hb_bool_tt { static constexpr bool value = b; };
typedef hb_bool_tt<true> hb_true_t;
typedef hb_bool_tt<false> hb_false_t;
@ -87,17 +87,17 @@ HB_FUNCOBJ (hb_addressof);
template <typename T> static inline T hb_declval ();
#define hb_declval(T) (hb_declval<T> ())
template <typename T> struct hb_match_const { typedef T type; enum { value = false }; };
template <typename T> struct hb_match_const<const T> { typedef T type; enum { value = true }; };
template <typename T> struct hb_match_const { typedef T type; static constexpr bool value = false; };
template <typename T> struct hb_match_const<const T> { typedef T type; static constexpr bool value = true; };
template <typename T> using hb_remove_const = typename hb_match_const<T>::type;
#define hb_is_const(T) hb_match_const<T>::value
template <typename T> struct hb_match_reference { typedef T type; enum { value = false }; };
template <typename T> struct hb_match_reference<T &> { typedef T type; enum { value = true }; };
template <typename T> struct hb_match_reference<T &&> { typedef T type; enum { value = true }; };
template <typename T> struct hb_match_reference { typedef T type; static constexpr bool value = false; };
template <typename T> struct hb_match_reference<T &> { typedef T type; static constexpr bool value = true; };
template <typename T> struct hb_match_reference<T &&> { typedef T type; static constexpr bool value = true; };
template <typename T> using hb_remove_reference = typename hb_match_reference<T>::type;
#define hb_is_reference(T) hb_match_reference<T>::value
template <typename T> struct hb_match_pointer { typedef T type; enum { value = false }; };
template <typename T> struct hb_match_pointer<T *> { typedef T type; enum { value = true }; };
template <typename T> struct hb_match_pointer { typedef T type; static constexpr bool value = false; };
template <typename T> struct hb_match_pointer<T *> { typedef T type; static constexpr bool value = true; };
template <typename T> using hb_remove_pointer = typename hb_match_pointer<T>::type;
#define hb_is_pointer(T) hb_match_pointer<T>::value
@ -173,42 +173,63 @@ template <typename T> struct hb_is_same<T, T> : hb_true_t {};
#define hb_is_same(T, T2) hb_is_same<T, T2>::value
template <typename T> struct hb_is_signed;
template <> struct hb_is_signed<char> { enum { value = CHAR_MIN < 0 }; };
template <> struct hb_is_signed<signed char> { enum { value = true }; };
template <> struct hb_is_signed<unsigned char> { enum { value = false }; };
template <> struct hb_is_signed<signed short> { enum { value = true }; };
template <> struct hb_is_signed<unsigned short> { enum { value = false }; };
template <> struct hb_is_signed<signed int> { enum { value = true }; };
template <> struct hb_is_signed<unsigned int> { enum { value = false }; };
template <> struct hb_is_signed<signed long> { enum { value = true }; };
template <> struct hb_is_signed<unsigned long> { enum { value = false }; };
template <> struct hb_is_signed<signed long long> { enum { value = true }; };
template <> struct hb_is_signed<unsigned long long> { enum { value = false }; };
template <> struct hb_is_signed<char> { static constexpr bool value = CHAR_MIN < 0; };
template <> struct hb_is_signed<signed char> { static constexpr bool value = true; };
template <> struct hb_is_signed<unsigned char> { static constexpr bool value = false; };
template <> struct hb_is_signed<signed short> { static constexpr bool value = true; };
template <> struct hb_is_signed<unsigned short> { static constexpr bool value = false; };
template <> struct hb_is_signed<signed int> { static constexpr bool value = true; };
template <> struct hb_is_signed<unsigned int> { static constexpr bool value = false; };
template <> struct hb_is_signed<signed long> { static constexpr bool value = true; };
template <> struct hb_is_signed<unsigned long> { static constexpr bool value = false; };
template <> struct hb_is_signed<signed long long> { static constexpr bool value = true; };
template <> struct hb_is_signed<unsigned long long> { static constexpr bool value = false; };
#define hb_is_signed(T) hb_is_signed<T>::value
template <typename T> struct hb_int_min { static constexpr T value = 0; };
template <> struct hb_int_min<char> { static constexpr char value = CHAR_MIN; };
template <> struct hb_int_min<int> { static constexpr int value = INT_MIN; };
template <> struct hb_int_min<long> { static constexpr long value = LONG_MIN; };
template <typename T> struct hb_int_min;
template <> struct hb_int_min<char> { static constexpr char value = CHAR_MIN; };
template <> struct hb_int_min<signed char> { static constexpr signed char value = SCHAR_MIN; };
template <> struct hb_int_min<unsigned char> { static constexpr unsigned char value = 0; };
template <> struct hb_int_min<signed short> { static constexpr signed short value = SHRT_MIN; };
template <> struct hb_int_min<unsigned short> { static constexpr unsigned short value = 0; };
template <> struct hb_int_min<signed int> { static constexpr signed int value = INT_MIN; };
template <> struct hb_int_min<unsigned int> { static constexpr unsigned int value = 0; };
template <> struct hb_int_min<signed long> { static constexpr signed long value = LONG_MIN; };
template <> struct hb_int_min<unsigned long> { static constexpr unsigned long value = 0; };
template <> struct hb_int_min<signed long long> { static constexpr signed long long value = LLONG_MIN; };
template <> struct hb_int_min<unsigned long long> { static constexpr unsigned long long value = 0; };
#define hb_int_min(T) hb_int_min<T>::value
template <typename T> struct hb_int_max;
template <> struct hb_int_max<char> { static constexpr char value = CHAR_MAX; };
template <> struct hb_int_max<signed char> { static constexpr signed char value = SCHAR_MAX; };
template <> struct hb_int_max<unsigned char> { static constexpr unsigned char value = UCHAR_MAX; };
template <> struct hb_int_max<signed short> { static constexpr signed short value = SHRT_MAX; };
template <> struct hb_int_max<unsigned short> { static constexpr unsigned short value = USHRT_MAX; };
template <> struct hb_int_max<signed int> { static constexpr signed int value = INT_MAX; };
template <> struct hb_int_max<unsigned int> { static constexpr unsigned int value = UINT_MAX; };
template <> struct hb_int_max<signed long> { static constexpr signed long value = LONG_MAX; };
template <> struct hb_int_max<unsigned long> { static constexpr unsigned long value = ULONG_MAX; };
template <> struct hb_int_max<signed long long> { static constexpr signed long long value = LLONG_MAX; };
template <> struct hb_int_max<unsigned long long> { static constexpr unsigned long long value = ULLONG_MAX; };
#define hb_int_max(T) hb_int_max<T>::value
template <bool is_signed> struct hb_signedness_int;
template <> struct hb_signedness_int<false> { typedef unsigned int value; };
template <> struct hb_signedness_int<true> { typedef signed int value; };
#define hb_signedness_int(T) hb_signedness_int<T>::value
template <typename T> struct hb_is_integer { enum { value = false }; };
template <> struct hb_is_integer<char> { enum { value = true }; };
template <> struct hb_is_integer<signed char> { enum { value = true }; };
template <> struct hb_is_integer<unsigned char> { enum { value = true }; };
template <> struct hb_is_integer<signed short> { enum { value = true }; };
template <> struct hb_is_integer<unsigned short> { enum { value = true }; };
template <> struct hb_is_integer<signed int> { enum { value = true }; };
template <> struct hb_is_integer<unsigned int> { enum { value = true }; };
template <> struct hb_is_integer<signed long> { enum { value = true }; };
template <> struct hb_is_integer<unsigned long> { enum { value = true }; };
template <> struct hb_is_integer<signed long long> { enum { value = true }; };
template <> struct hb_is_integer<unsigned long long> { enum { value = true }; };
template <typename T> struct hb_is_integer { static constexpr bool value = false;};
template <> struct hb_is_integer<char> { static constexpr bool value = true; };
template <> struct hb_is_integer<signed char> { static constexpr bool value = true; };
template <> struct hb_is_integer<unsigned char> { static constexpr bool value = true; };
template <> struct hb_is_integer<signed short> { static constexpr bool value = true; };
template <> struct hb_is_integer<unsigned short> { static constexpr bool value = true; };
template <> struct hb_is_integer<signed int> { static constexpr bool value = true; };
template <> struct hb_is_integer<unsigned int> { static constexpr bool value = true; };
template <> struct hb_is_integer<signed long> { static constexpr bool value = true; };
template <> struct hb_is_integer<unsigned long> { static constexpr bool value = true; };
template <> struct hb_is_integer<signed long long> { static constexpr bool value = true; };
template <> struct hb_is_integer<unsigned long long> { static constexpr bool value = true; };
#define hb_is_integer(T) hb_is_integer<T>::value