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[meta] Rewrite is_signed, add is_unsigned

This commit is contained in:
Behdad Esfahbod 2019-05-10 20:26:29 -07:00
parent e939d88bd7
commit ce300f4fb6
1 changed files with 11 additions and 16 deletions
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27
src/hb-meta.hh
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@ -251,24 +251,19 @@ using hb_is_arithmetic = hb_bool_constant<
hb_is_floating_point (T) ||
false
>;
#define hb_is_arighmetic(T) hb_is_arighmetic<T>::value
#define hb_is_arithmetic(T) hb_is_arithmetic<T>::value
template <typename T> struct hb_is_signed;
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; };
template <> struct hb_is_signed<float> { static constexpr bool value = true; };
template <> struct hb_is_signed<double> { static constexpr bool value = true; };
template <> struct hb_is_signed<long double> { static constexpr bool value = true; };
template <typename T>
using hb_is_signed = hb_conditional<hb_is_arithmetic (T),
hb_bool_constant<(T) -1 < (T) 0>,
hb_false_type>;
#define hb_is_signed(T) hb_is_signed<T>::value
template <typename T>
using hb_is_unsigned = hb_conditional<hb_is_arithmetic (T),
hb_bool_constant<(T) 0 < (T) -1>,
hb_false_type>;
#define hb_is_unsigned(T) hb_is_unsigned<T>::value
template <typename T> struct hb_int_min;
template <> struct hb_int_min<char> { static constexpr char value = CHAR_MIN; };