std::nothrow

#include <iostream>
#include <new>

int main()
{
    try
    {
        while (true)
        {
            new int[100000000ul];   //   
        }
    }
    catch (const std::bad_alloc& e)
    {
        std::cout << e.what() << '\n';
    }

    while (true)
    {
        //    
        int* p = new(std::nothrow) int[100000000ul];
        if (p == nullptr)
        {
            std::cout << "  nullptr\n";
            break;
        }
    }
}