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Fix FixedVector move semantics.

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This commit is contained in:
Lukas Tenbrink 2025-05-31 18:22:16 +02:00
parent b89c47bb85
commit c3476b8205
2 changed files with 79 additions and 12 deletions
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50
core/templates/fixed_vector.h
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@ -51,6 +51,7 @@ class FixedVector {
public:
_FORCE_INLINE_ constexpr FixedVector() = default;
constexpr FixedVector(std::initializer_list<T> p_init) {
ERR_FAIL_COND(p_init.size() > CAPACITY);
for (const T &element : p_init) {
@ -58,9 +59,7 @@ public:
}
}
template <uint32_t p_capacity>
constexpr FixedVector(const FixedVector<T, p_capacity> &p_from) {
ERR_FAIL_COND(p_from.size() > CAPACITY);
constexpr FixedVector(const FixedVector &p_from) {
if constexpr (std::is_trivially_copyable_v<T>) {
// Copy size and all provided elements at once.
memcpy((void *)&_size, (void *)&p_from._size, sizeof(_size) + DATA_PADDING + p_from.size() * sizeof(T));
@ -71,15 +70,48 @@ public:
}
}
template <uint32_t p_capacity>
constexpr FixedVector(FixedVector<T, p_capacity> &&p_from) {
ERR_FAIL_COND(p_from.size() > CAPACITY);
constexpr FixedVector(FixedVector &&p_from) {
// Copy size and all provided elements at once.
// Note: Assumes trivial relocatability.
memcpy((void *)&_size, (void *)&p_from._size, sizeof(_size) + DATA_PADDING + p_from.size() * sizeof(T));
p_from._size = 0;
}
constexpr FixedVector &operator=(const FixedVector &p_from) {
if constexpr (std::is_trivially_copyable_v<T>) {
// Copy size and all provided elements at once.
memcpy((void *)&_size, (void *)&p_from._size, sizeof(_size) + DATA_PADDING + p_from.size() * sizeof(T));
} else {
// Destruct extraneous elements.
if constexpr (!std::is_trivially_destructible_v<T>) {
for (uint32_t i = p_from.size(); i < _size; i++) {
ptr()[i].~T();
}
}
_size = 0; // Loop-assign the rest.
for (const T &element : p_from) {
ptr()[_size++] = element;
}
}
return *this;
}
constexpr FixedVector &operator=(FixedVector &&p_from) {
// Destruct extraneous elements.
if constexpr (!std::is_trivially_destructible_v<T>) {
for (uint32_t i = p_from.size(); i < _size; i++) {
ptr()[i].~T();
}
}
// Relocate elements (and size) into our buffer.
memcpy((void *)&_size, (void *)&p_from._size, sizeof(_size) + DATA_PADDING + p_from.size() * sizeof(T));
p_from._size = 0;
return *this;
}
~FixedVector() {
if constexpr (!std::is_trivially_destructible_v<T>) {
for (uint32_t i = 0; i < _size; i++) {
@ -136,6 +168,12 @@ public:
_size++;
}
constexpr void push_back(T &&p_val) {
ERR_FAIL_COND(_size >= CAPACITY);
memnew_placement(ptr() + _size, T(std::move(p_val)));
_size++;
}
constexpr void pop_back() {
ERR_FAIL_COND(_size == 0);
_size--;