Method reallocate_impl

src/fl/stl/allocator.h:182–204

SFINAE: Use fl::realloc() for trivially copyable types

private:
    // SFINAE: Use fl::realloc() for trivially copyable types
    pointer reallocate_impl(pointer ptr, fl::size old_count, fl::size new_count, fl::true_type) FL_NOEXCEPT {
        if (new_count == 0) {
            if (ptr) {
                deallocate(ptr, old_count);
            }
            return nullptr;
        }

        // Safe to use realloc() - type is trivially copyable
        void* result = fl::realloc(ptr, new_count * sizeof(T));
        if (!result) {
            return nullptr;  // Realloc failed
        }

        T* new_ptr = static_cast<T*>(result);

        // Zero-initialize any newly allocated memory
        if (new_count > old_count) {
            fl::memset(new_ptr + old_count, 0, (new_count - old_count) * sizeof(T));
        }

        return new_ptr;
    }

    // SFINAE: Don't use realloc() for non-trivially-copyable types
    pointer reallocate_impl(pointer ptr, fl::size old_count, fl::size new_count, fl::false_type) FL_NOEXCEPT {