What does it mean to use an intra-class initializer in a constructor?

Question

C++ / C#

By subject.
I was surprised when I googled this:

По запросу что значит внутриклассовый инициализатор ничего не найдено. 

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Answer 1

Take the book where you read it, find the original in English and google it according to the original, and not according to the attempts of translators. Well, or give the context, code, etc.

Answer 2

"in-class initialization"
This is a C11 feature;
When declaring a class, it was previously impossible to do something like this:

class Foo {
 public:
  int bar = 42;
 };

It was possible to initialize in a similar way the current static const int types. For everything else, initialization lists after the constructor were used. It's bad when there are a lot of designers. In the 11 standard, it is now allowed to initialize with a value immediately after the declaration in the class.

Answer 3

Maybe you mean the list of initialization of class members in the constructor?

class A { 
int A,B;
A() : A(0), B(0) {};
...
}

If not, then more information is required. Where did you find it yourself? In what context?