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internals: optimize std::unordered_map internals with noexcept (#5960)

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This commit is contained in:
Aaron Gokaslan
2026-02-17 02:00:56 -05:00
committed by GitHub
parent ccb7129f54
commit ac286c932f
1 changed files with 3 additions and 3 deletions
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6
include/pybind11/detail/internals.h
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@@ -191,7 +191,7 @@ inline bool same_type(const std::type_info &lhs, const std::type_info &rhs) {
}
struct type_hash {
size_t operator()(const std::type_index &t) const {
size_t operator()(const std::type_index &t) const noexcept {
size_t hash = 5381;
const char *ptr = t.name();
while (auto c = static_cast<unsigned char>(*ptr++)) {
@@ -202,7 +202,7 @@ struct type_hash {
};
struct type_equal_to {
bool operator()(const std::type_index &lhs, const std::type_index &rhs) const {
bool operator()(const std::type_index &lhs, const std::type_index &rhs) const noexcept {
return lhs.name() == rhs.name() || std::strcmp(lhs.name(), rhs.name()) == 0;
}
};
@@ -218,7 +218,7 @@ template <typename value_type>
using type_map = std::unordered_map<std::type_index, value_type, type_hash, type_equal_to>;
struct override_hash {
size_t operator()(const std::pair<const PyObject *, const char *> &v) const {
size_t operator()(const std::pair<const PyObject *, const char *> &v) const noexcept {
size_t value = std::hash<const void *>()(v.first);
value ^= std::hash<const void *>()(v.second) + 0x9e3779b9 + (value << 6) + (value >> 2);
return value;