Valid c ++ Study Notes

Valid c ++ Study Notes

Clause 1:

 

The C ++ language can be seen as a mixture of multiple sub-languages.

1,C

2,Template

3,STL

4,Class

 

Clause 2:

 

1,For simple constants, such as constants that declare the length of an array in a class, you can use

ENum{}, You can use

Constexpr static or const staticTo replace,

 

2,# Define cannot support encapsulation., Avoid as much as possible, of course, like

# Ifdef, # endif Still useful (the compiler will directly replace the macro used)

 

3. Use inline to replace macros such as functions (otherwise, many side effects will occur)

 

Clause 3:

 

1. Many functions return a constant value of const to avoid unreasonable operations on the returned value, such

Class {}

Const A operator * (const A & x, const A & y );

Without a const, it is possible to perform a meaningless value assignment operation on the function return value.