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[hash] Add hash impl for integers

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Part of https://github.com/harfbuzz/harfbuzz/issues/4227
This commit is contained in:
Behdad Esfahbod 2023-05-08 16:31:58 -06:00
parent b7a8d23bc8
commit 0e02680803
1 changed files with 5 additions and 1 deletions
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6
src/hb-algs.hh
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@ -236,7 +236,11 @@ struct
private:
template <typename T> constexpr auto
impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, hb_deref (v).hash ())
impl (const T& v, hb_priority<2>) const HB_RETURN (uint32_t, hb_deref (v).hash ())
// Horrible: std:hash() of integers seems to be identity in gcc / clang?!
template <typename T> constexpr auto
impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, v * 2654435761u)
template <typename T> constexpr auto
impl (const T& v, hb_priority<0>) const HB_RETURN (uint32_t, std::hash<hb_decay<decltype (hb_deref (v))>>{} (hb_deref (v)))