drinkingtea/nostalgia
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[ox/std] Make Vector only call constructor and destructor on valid items

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This commit is contained in:
Gary Talent 2019-07-12 22:48:10 -05:00
parent 806eaa229a
commit 16a09d6814
2 changed files with 44 additions and 5 deletions
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34
deps/ox/src/ox/std/typetraits.hpp vendored
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@ -10,6 +10,21 @@
#include "bitops.hpp"
#if __has_include(<type_traits>)
#include <type_traits>
#else
namespace std {
template<typename T>
constexpr bool is_union_v<T> = __is_union(T);
}
#endif
namespace ox {
template<typename T>
@ -51,6 +66,25 @@ template<> struct is_integral<uint32_t>: ox::true_type {};
template<> struct is_integral<int64_t> : ox::true_type {};
template<> struct is_integral<uint64_t>: ox::true_type {};
template<typename T> struct is_union: ox::integral_constant<bool, std::is_union_v<T>> {};
// indicates the type can have members, but not that it necessarily does
template<typename T>
constexpr uint8_t memberable(int T::*) { return true; }
template<typename T>
constexpr uint16_t memberable(...) { return false; }
template<typename T>
struct is_class: ox::integral_constant<bool, !ox::is_union<T>::value && ox::memberable<T>(0)> {};
namespace test {
class TestClass {int i;};
union TestUnion {int i;};
static_assert(ox::is_class<TestClass>::value == true);
static_assert(ox::is_class<TestUnion>::value == false);
static_assert(ox::is_class<int>::value == false);
}
template<typename T>
constexpr bool is_signed = ox::integral_constant<bool, T(-1) < T(0)>::value;

15
deps/ox/src/ox/std/vector.hpp vendored
View File

@ -85,7 +85,7 @@ template<typename T>
Vector<T>::Vector(std::size_t size) noexcept {
m_size = size;
m_cap = m_size;
m_items = new T[m_cap];
m_items = reinterpret_cast<T*>(new char[m_cap * sizeof(T)]);
for (std::size_t i = 0; i < size; i++) {
m_items[i] = {};
}
@ -95,7 +95,7 @@ template<typename T>
Vector<T>::Vector(Vector<T> &other) noexcept {
m_size = other.m_size;
m_cap = other.m_cap;
m_items = new T[m_cap];
m_items = reinterpret_cast<T*>(new char[m_cap * sizeof(T)]);
for (std::size_t i = 0; i < m_size; i++) {
m_items[i] = ox::move(other.m_items[i]);
}
@ -113,7 +113,12 @@ Vector<T>::Vector(Vector<T> &&other) noexcept {
template<typename T>
Vector<T>::~Vector() noexcept {
delete[] m_items;
if constexpr(ox::is_class<T>()) {
for (std::size_t i = 0; i < m_size; i++) {
m_items[i].~T();
}
}
delete[] reinterpret_cast<char*>(m_items);
m_items = nullptr;
}
@ -244,7 +249,7 @@ template<typename T>
void Vector<T>::expandCap(std::size_t cap) noexcept {
auto oldItems = m_items;
m_cap = cap;
m_items = new T[m_cap];
m_items = reinterpret_cast<T*>(new char[m_cap * sizeof(T)]);
if (oldItems) { // move over old items
const auto itRange = cap > m_size ? m_size : cap;
for (std::size_t i = 0; i < itRange; i++) {
@ -253,7 +258,7 @@ void Vector<T>::expandCap(std::size_t cap) noexcept {
for (std::size_t i = itRange; i < m_cap; i++) {
new (&m_items[i]) T;
}
delete[] oldItems;
delete[] reinterpret_cast<char*>(m_items);
}
}