#include <type_traits>
#include <stdexcept>
#include <memory>
#include <iostream>
struct T {
int val;
T() = delete;
T(int i) : val(i) {}
void* operator new[](std::size_t, std::size_t cnt, const T& t)
{
typedef std::aligned_storage<sizeof(t),
std::alignment_of<T>::value>::type buf;
T* ptr = reinterpret_cast<T*>(new buf[cnt]);
std::uninitialized_fill_n(ptr, cnt, t);
return ptr;
}
};
int main()
{
T* a = new(100, T(7)) T[0]; // using zero is legal per 5.3.4/7
std::cout << "a[0] = " << a[0].val << '\n'
<< "a[1] = " << a[1].val << '\n'
<< "a[98] = " << a[98].val << '\n'
<< "a[99] = " << a[99].val << '\n';
delete[] a; // I know this won't call the 100 destructors, but it will free the 100 aligned_storages at least
}
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