struct person_info
{
   std::string name;
   std::string female;
};

...

person_info person= {"Ivan", "Ivanov"}; // ok

st s = { 0 };

st s({ 0 });

 7   If there are fewer initializers in the list than there are members in the aggregate, then each member not
  explicitly initialized shall be value-initialized ( 8 . 5 ). [Example:
        struct S { int a; char* b; int c; };
        S ss = {  1 , "asdf" };
  initializes ss.a with  1 , ss.b with "asdf", and ss.c with the value of an expression of the form
  int(), that is,  0 . ]
 8   An initializer for an aggregate member that is an empty class shall have the form of an empty initializer-list
  {}. [Example:
        struct S { };
        struct A {
                    S s;
                    int i;
        } a = { { } ,  3  };
   —end example] An empty initializer-list can be used to initialize any aggregate. If the aggregate is not an
  empty class, then each member of the aggregate shall be initialized with a value of the form T() ( 5 . 2 . 3 ),
  where T represents the type of the uninitialized member.

st s = {};

struct stTest
{
	int a;
	double b;
	/*... 
	огромный список
	...*/
};

stTest s = {};