String length check in argument at compile time

[snoozerman]

Hi,
Just can't figure this out despite having spent hours reading about pointer etc.
Is it possible to pass a char* to a function and have the length checked at compile time?
With a structue I can do this

typedef char t_mystring[3];  
typedef struct t_mystruct {
  t_mystring str;
};

t_mystruct s1 = {"f"};    // Ok
t_mystruct s2 = {"fo"};   // Ok
t_mystruct s3 = {"foo"};  // Fails as expected - perfect!
// s3 line give compiler "error: initializer-string for array of chars is too long" 

Now, since I a want some functionallity associated to the structure I'd like to make a class to which I pass the string to the constructor. Compare below.

typedef char t_mystring[3];  
class MyClass {
  t_mystring s;
public :
  MyClass(t_mystring initstr) {
    s = initstr;    // Fails with;
    // error: incompatible types in assignment of 'char*' to 'char [3]'
  };
};

MyClass obj1 = MyClass("f");    // Should compile
MyClass obj2 = MyClass("fo");   // Should compile
MyClass obj3 = MyClass("foo");  // Should fail with same error as for t_mystruct s3 = {"foo"} 

Is it possible to make the compiler check the stringlength of the constructor argument? Any help sooo much appreciated!