With constructor in C++17

with.cpp

#include <cstdio>

#define with(a) if(a ; true)

struct ExampleScopeGuard
{
    ExampleScopeGuard () : foo(5)
    { 
        printf("ACQUIRE\n");
    }

    ~ExampleScopeGuard ()  
    { 
        printf("RELEASE\n");
    }

    int foo;
};



int main ()
{

// Prints:
//     ACQUIRE
//         INSIDE: 5
//     RELEASE

with(ExampleScopeGuard guard)
{
    printf("\t INSIDE: %d\n", guard.foo);
}

// instead of
{
    ExampleScopeGuard guard;
    printf("\t INSIDE: %d\n", guard.foo);
}

return 0;

}