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This article mainly explains "how to define and initialize data members in C++". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought. Let's study and learn how to define and initialize data members in C++.

C.47: define and initialize data member Reason in the order in which member variables are declared (reason)

Minimize confusion and errors. This is the order in which initialization is performed (regardless of the order of member initializers).

Example, bad (negative example) class Foo {

Int m1

Int m2

Public:

Foo (int x): m2 {x}, M1 {+ + x} {} / / BAD: misleading initializer order

/ /...

}

Foo x (1); / / surprise: x.m1 = = x.m2 = = 2Enforcement (implementation recommendation)

(simple) the member initialization list should process them in the order in which they are declared.

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