Built-in type 0 initialization issues

For example, with the following piece of code, we can quickly realize that both X and PTR start with undefined values, but SC obviously calls its default constructor to get a reasonable initialization.

Class someclass{

Public

SomeClass (): Val () {}

Private

int Val;

}

void Foo () {
int x;
int *ptr;

SomeClass SC;

......

}

In C + +, there is some difference between handling the underlying type (int, bool, float, double, pointer type, etc.) with the class type. The underlying type does not exist so-called default constructors for initialization.

In the template programming, you can use the following scheme, so that even for the built-in type, you can get the appropriate initialization, the integer initialization of 0, the pointer type is also initialized to 0.

Template <typename t> void foo () {     T x = t ();    is  zero (or false  

Template <typename t> class MyClass {   private:     T x;   Public:     MyClass (): X () {was  initialized even for built-in types     }      

Built-in type 0 initialization issues