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author | Lioncash <mathew1800@gmail.com> | 2019-11-13 20:58:40 +0100 |
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committer | Lioncash <mathew1800@gmail.com> | 2019-11-13 20:58:43 +0100 |
commit | c5c89a4d5c57fd4691981601ada0d9ffe3cf72d0 (patch) | |
tree | e5d2309501c76e5d663d382356d8c6f619d1e3e0 /src/common | |
parent | Merge pull request #3103 from lioncash/cfunc (diff) | |
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Diffstat (limited to '')
-rw-r--r-- | src/common/hash.h | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/src/common/hash.h b/src/common/hash.h index ebd4125e2..b2538f3ea 100644 --- a/src/common/hash.h +++ b/src/common/hash.h @@ -35,41 +35,6 @@ static inline u64 ComputeStructHash64(const T& data) { return ComputeHash64(&data, sizeof(data)); } -/// A helper template that ensures the padding in a struct is initialized by memsetting to 0. -template <typename T> -struct HashableStruct { - // In addition to being trivially copyable, T must also have a trivial default constructor, - // because any member initialization would be overridden by memset - static_assert(std::is_trivial_v<T>, "Type passed to HashableStruct must be trivial"); - /* - * We use a union because "implicitly-defined copy/move constructor for a union X copies the - * object representation of X." and "implicitly-defined copy assignment operator for a union X - * copies the object representation (3.9) of X." = Bytewise copy instead of memberwise copy. - * This is important because the padding bytes are included in the hash and comparison between - * objects. - */ - union { - T state; - }; - - HashableStruct() { - // Memset structure to zero padding bits, so that they will be deterministic when hashing - std::memset(&state, 0, sizeof(T)); - } - - bool operator==(const HashableStruct<T>& o) const { - return std::memcmp(&state, &o.state, sizeof(T)) == 0; - }; - - bool operator!=(const HashableStruct<T>& o) const { - return !(*this == o); - }; - - std::size_t Hash() const { - return Common::ComputeStructHash64(state); - } -}; - struct PairHash { template <class T1, class T2> std::size_t operator()(const std::pair<T1, T2>& pair) const noexcept { |