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Try using std::hash<std::type_index>, std::equal_to<std::type_index> everywhere.

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From PR #4316 we know that types in the unnamed namespace in different translation units do not compare equal, as desired.

But do types in named namespaces compare equal, as desired?
This commit is contained in:
Ralf W. Grosse-Kunstleve 2022-11-06 15:05:15 -08:00
parent ee2b522629
commit a06949a926
1 changed files with 1 additions and 26 deletions
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27
include/pybind11/detail/internals.h
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@ -114,35 +114,10 @@ inline void tls_replace_value(PYBIND11_TLS_KEY_REF key, void *value) {
// libstdc++, this doesn't happen: equality and the type_index hash are based on the type name,
// which works. If not under a known-good stl, provide our own name-based hash and equality
// functions that use the type name.
#if defined(__GLIBCXX__)
inline bool same_type(const std::type_info &lhs, const std::type_info &rhs) { return lhs == rhs; }
using type_hash = std::hash<std::type_index>;
using type_equal_to = std::equal_to<std::type_index>;
#else
inline bool same_type(const std::type_info &lhs, const std::type_info &rhs) {
return lhs.name() == rhs.name() || std::strcmp(lhs.name(), rhs.name()) == 0;
}
struct type_hash {
size_t operator()(const std::type_index &t) const {
size_t hash = 5381;
const char *ptr = t.name();
while (auto c = static_cast<unsigned char>(*ptr++)) {
hash = (hash * 33) ^ c;
}
return hash;
}
};
struct type_equal_to {
bool operator()(const std::type_index &lhs, const std::type_index &rhs) const {
return lhs.name() == rhs.name() || std::strcmp(lhs.name(), rhs.name()) == 0;
}
};
#endif
template <typename value_type>
using type_map = std::unordered_map<std::type_index, value_type, type_hash, type_equal_to>;
using type_map = std::unordered_map<std::type_index, value_type>;
struct override_hash {
inline size_t operator()(const std::pair<const PyObject *, const char *> &v) const {