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support older version cpp compiler to use is_trivially_copyable

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This commit is contained in:
sunkaicheng
2019-08-20 09:54:09 +08:00
parent 6ae6e2ee49
commit e3c55f9830
2 changed files with 15 additions and 26 deletions
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parallel_hashmap/phmap_base.h
Vendored
+12 -3
View File
@@ -82,12 +82,21 @@ struct PairTrait<std::pair<T1, T2>>: public std::true_type {
using second_type = T2;
};
template<typename T>
#if defined(__GLIBCXX__) && __GLIBCXX__ < 20150801
struct IsTriviallyCopyable : public std::integral_constant<bool, __has_trivial_copy(T)> {
};
#else
struct IsTriviallyCopyable : public std::is_trivially_copyable<T> {
};
#endif
template<typename V>
struct IsDumpableType {
static constexpr bool value = std::is_trivially_copyable<V>::value
static constexpr bool value = IsTriviallyCopyable<V>::value
|| (PairTrait<V>::value
&& std::is_trivially_copyable<typename PairTrait<V>::first_type>::value
&& std::is_trivially_copyable<typename PairTrait<V>::second_type>::value);
&& IsTriviallyCopyable<typename PairTrait<V>::first_type>::value
&& IsTriviallyCopyable<typename PairTrait<V>::second_type>::value);
};
template <typename... Ts>
parallel_hashmap/phmap_utils.h
Vendored
+3 -23
View File
@@ -326,7 +326,7 @@ public:
~ArchiveGuard() {
if (ar_) {
ar_->finish();
}
}
}
private:
Archive* ar_;
@@ -351,23 +351,13 @@ public:
}
template<typename V>
typename std::enable_if<std::is_trivially_copyable<V>::value, bool>::type
typename std::enable_if<type_traits_internal::IsTriviallyCopyable<V>::value, bool>::type
dump(const V& v) {
CHECK_FILE(ofs_);
ofs_.write(reinterpret_cast<char*>(const_cast<V*>(&v)), sizeof(V));
return true;
}
template<typename V>
typename std::enable_if<type_traits_internal::PairTrait<V>::value
&& type_traits_internal::IsDumpableType<V>::value, bool>::type
dump(const V& v) {
using first_type = typename type_traits_internal::PairTrait<V>::first_type;
using second_type = typename type_traits_internal::PairTrait<V>::second_type;
return dump<first_type>(v.first)
&& dump<second_type>(v.second);
}
void finish() {
if (ofs_.is_open()) {
ofs_.close();
@@ -397,23 +387,13 @@ public:
}
template<typename V>
typename std::enable_if<std::is_trivially_copyable<V>::value, bool>::type
typename std::enable_if<type_traits_internal::IsTriviallyCopyable<V>::value, bool>::type
load(V* v) {
CHECK_FILE(ifs_);
ifs_.read(reinterpret_cast<char*>(v), sizeof(V));
return true;
}
template<typename V>
typename std::enable_if<type_traits_internal::PairTrait<V>::value
&& type_traits_internal::IsDumpableType<V>::value, bool>::type
load(V* v) {
using first_type = typename std::remove_cv<typename type_traits_internal::PairTrait<V>::first_type>::type;
using second_type = typename std::remove_cv<typename type_traits_internal::PairTrait<V>::second_type>::type;
return load<first_type>(const_cast<first_type*>(&v->first))
&& load<second_type>(const_cast<second_type*>(&v->second));
}
void finish() {
if (ifs_.is_open()) {
ifs_.close();