c++ call constructor from constructor

class Test {
    public Test() {
        DoSomething();
    }

    public Test(int count) : this() {
        DoSomethingWithCount(count);
    }

    public Test(int count, string name) : this(count) {
        DoSomethingWithName(name);
    }
}

class Foo {
 public:
   Foo(char x, int y=0);  // combines two constructors (char) and (char, int)
   ...
 };

class Foo {
 public:
   Foo(char x);
   Foo(char x, int y);
   ...
 private:
   void init(char x, int y);
 };

 Foo::Foo(char x)
 {
   init(x, int(x) + 7);
   ...
 }

 Foo::Foo(char x, int y)
 {
   init(x, y);
   ...
 }

 void Foo::init(char x, int y)
 {
   ...
 }

class Foo {
public:
  Foo(char x, int y) {}
  Foo(int y) : Foo('a', y) {}
};

class SomeType
{
  int number;

public:
  SomeType(int newNumber) : number(newNumber) {}
  SomeType() : SomeType(42) {}
};

class Foo() {
    Foo() { /* default constructor deliciousness */ }
    Foo(Bar myParam) {
      new (this) Foo();
      /* bar your param all night long */
    }
};

class Foo  {
     int d;
public:
    Foo  (int i) : d(i) {}
    Foo  () : Foo(42) {} //new to c++11
};

class Foo  {
     int d = 5;
public:
    Foo  (int i) : d(i) {}
};