Constraints for assigning values according to ansi c:
1. Both operands are pointers to compatible types with or without delimiters.
2. the type pointed to by the Left pointer must have all the qualifiers of the type pointed to by the right
Const T, const T *, T * const, const T &, const T * & difference, const
Here T refers to a data type, which can be basic data types such as int, long, and doule, or class of its own type. A single const must be a constant, but are you confused
The use of const in C + + is very extensive, different location to use the meaning is not the same, so want to write an article to make a summary.
First of all, it is clear that the const is the basic meaning of "unchanging", but the same does not
Use const whenever possible
One wonderful thing about const is that it allows you to specify a semantic constraint: a specific object should not be modified. The compiler will execute this constraint. It allows you to notify the compiler and other
Seeing the const keyword, the first thing a C + + programmer might think of is a const constant. This is not a good reflex. If you only know to define constants with const, then it is equivalent to using gunpowder only to make firecrackers. The
Item 3: Use const whenever possible
By Scott Meyers
Translator: fatalerror99 (itepub's nirvana)
Release: http://blog.csdn.net/fatalerror99/
One wonderful thing about const is that it allows you to specify a semantic (semantic) Constraint: a specific
Seeing the const keyword, the first thing a C + + programmer might think of is a const constant. This is not a good reflex. If you only know to define constants with const, then it is equivalent to using gunpowder only to make firecrackers. The
1. Defining constants(1) The const modifier variable, the following two kinds of definition form are essentially the same. It means that the variable value of the type with the Const modifier is immutable.
TYPE const VALUENAME = value;
The use of const in C + + is very wide, the meaning of the use of different locations is not the same, so want to write an article to do a summary. First, it is clear that const is the basic meaning of "unchanging", but it does not mean that
Const is the abbreviation of constant, the meaning of "constant unchanged". The const-modified items are protected against accidental changes and can improve the robustness of the program. So many C + + programming books suggest: "Use const whenever
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