How does C++ initialize data members using in-class initializers
This article mainly introduces "how C++ uses in-class initializers to initialize data members". In daily operations, I believe many people have doubts about how C++ uses in-class initializers to initialize data members. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "how C++ uses in-class initializers to initialize data members". Next, please follow the editor to study!
C.45: don't just initialize the default constructor for data members; use in-class member initializers
Reason (reason)
Using an in-class initializer allows the compiler to generate a function for you. Functions generated by the compiler are more efficient.
Example, bad (negative example) class X1 {/ / BAD: doesn't use member initializers
String s
Int i
Public:
X1 (): s {"default"}, I {1} {}
/ /...
}; Example (sample) class X2 {
String s = "default"
Int I = 1
Public:
/ / use compiler-generated default constructor
/ /...
}; Enforcement (implementation recommendations)
(simple) the default constructor should do more than initializing data members with constants.
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