static-allocation.cpp

#include <stdio.h>
#include <string.h>

// Defining NEW to 1 will trigger the new method of allocating objects
// statically
//#define NEW 1
#define COPY_ERROR 0

class A {
public:
    int data;
    int data2;
    int data3 = 3;
    int data4;

#if NEW
    static A create() {
        return A{};
    }

    constexpr A(A &&other) = default;

    /* Do not allow copies */
    A(const A &other) = delete;
    A& operator=(const A&) = delete;

private:
#endif
    A() : data2(2) { }
};

static A b
#if NEW
    = A::create()
#endif
    ;

int main()
{
    printf("%d\n", b.data);
    printf("%d\n", b.data2);
    printf("%d\n", b.data3);
    printf("%d\n", b.data4);

    // copy should not be allowed
#if COPY_ERROR
    A a = b;
    printf("%d\n", b.data);
    printf("%d\n", b.data2);
    printf("%d\n", b.data3);
    printf("%d\n", b.data4);
#endif

    return 0;
}