C++ Equivalent to Designated Initializers?

Question

Recently I\'ve been working on some embedded devices, where we have some structs and unions that need to be initialized at compile time so that we can keep certain things in

Answer 1

#ifdef __cplusplus
struct Foo
{
    Foo(int a, int b) : a(a), b(b) {}
    int a;
    int b;
};

union Bar
{
    Bar(int a) : a(a) {}
    Bar(float b) : b(b) {}
    int a;
    float b;
};

static Foo foo(1,2);
static Bar bar1(1);
static Bar bar2(1.234f);
#else 
 /* C99 stuff */
#endif // __cplusplus

In C++ union can have constructors too. May be this is what you wanted?