c const

Transferred from http://www.cnblogs.com/yedaoq/archive/2011/04/29/2032597.html1#const_cast   Description from msdn : A pointer to an object or an object member can be explicitly converted to the same type with different const, volatile, or

There are two ways to define constants in C #: compile-time constant and runtime constant ). The former is defined by "const", and the latter is defined by "readonly.   For a static constant (compile-time constant), the writing method is as

  1. Define a const object Const converts an object into a constant: Const int bufsize = 512; Define the bufsize as a constant and initialize it to 512. Since constants cannot be modified after definition, they must be initialized during definition.

Daily use of C-language constEvery day, I picked up a C-language shell, which grew up and formed thousands of miles.Today's shells: C-language const can improve program security and reliability to a certain extent.1. const modifies the read-only

Compiled correctlyCode:   # Include # include # include using namespace STD; Class t {public: T (string p) {ptext = P;} const char & operator [] (int pos) const {return ptext [POS];} string ptext ;}; int main () {string S = "ABCD"; t (s ); // T [

Const is a constant, readonly is read-only, and "blog Er" knows that :) So what are their differences? My personal summary is as follows: I. Assignment 1) The variable modified by const must be assigned an initial value during definition, and

1. General Constants Int const x = 2; or const int x = 2; Of course, X is also an array, such as X [5]; int can be replaced with the class name, and X is the object name, which is usually an object at this time. If int is replaced with char *, It is

A const reference is a reference to a const object. Copy codeThe Code is as follows: const int I = 10; Const int & ref = I; You can read the ref but cannot modify it. This makes sense, because I itself cannot be modified, and of course it cannot

# Include Using namespace STD;Class AA{ Public:AA (int s){X = s;}Void setx (INT) const;Void pp () const;PRIVATE:Int X;   };Void AA: setx (INT s) const // The constant function cannot modify the member.{// X = s;}Void AA: pp () const{Cout }Int main ()

I. Role of const: 1. Modify the value specified by const Ex1.1: Const int a = 2; // A = 3; error: assignment of read-only variable Just like a macro in C language, a will be put into the symbol list, but a is an internal link (internal link refers

1. The const modifier variable, which indicates that the value of the variable does not change:Const TYPE ValueName = value;2. The pointer uses the const(1) The pointer itself is constant, with the following two types of notation:(char*) const pName;

Record important c ++ learning records 1 const understanding:1. const modifies Common variables and pointersThe const modifier variable can be written in two ways:Const TYPE value;TYPE const value; These two methods are essentially the same. It

  [Disclaimer: All Rights Reserved. You are welcome to reprint it. Do not use it for commercial purposes. Contact Email: feixiaoxing @ 163.com]         Const is a keyword in C/C ++, but if it is used well, it can greatly improve the robustness of

Const defines a static value that is often assigned during object initialization. It cannot be changed later. It is a compilation constant. Static defines a Static variable. You can change its value externally .. Readonly is a read-only variable. It

Pre-knowledge1. Code Conversion Analysis Skillsin the early days some compilers translated C + + code into C code and then used the C compiler to build the executable file. One translation is to explicitly add the this pointer to the first parameter

"Reprint" Transfer from https://www.cnblogs.com/chogen/p/4574118.htmlConst is a C + + language qualifier that restricts a variable from being allowed to change. The use of const can improve the security and reliability of the program to some extent.

C + + references-temporary variables, reference parameters, and const referencesIf the actual participation reference parameter does not match, C + + generates a temporary variable. If the reference parameter is const, the compiler generates a

Defined The Const keyword is scoped to the type of the variable. The value of a const-modified variable cannot be changed (it can no longer be assigned after initialization), for example:const int NUM1 = 1;NUM1 = 1; Errorconst indicates that

C + + In the use of the Const keyword is very flexible, and using the const will greatly improve the robustness of the program, I based on all aspects of the information to summarize the following, I hope to help friends. Const is a commonly used

The above blog we have introduced the basic const, for this blog, first, what is a reference: A reference is a different name for the object, and a reference type refers to another type. How to define: To define a reference type by writing the