Con.4: Use const to define objects with values that do not change after construction Con.4:如果一个对象在构建之后值不会改变...,使用const定义它 Reason(原因) Prevent surprises from unexpectedly changed object values....防止对象值被意外修
// constant_member_function.cppclassDate{public: Date(intmn,intdy,intyr );intgetMonth()const;// A read-only functionvoidsetMonth(intmn );// A write function; can't be constprivate:intmonth; };intDate::getMonth()const{returnmonth;// Doesn't modify anything}voidDate::setMonth(intmn )...
$ gcc const.c $ ./a.out before, i=2after, i=3 1. 2. 3. 4. 可以看到使用const修饰的“常量”i的值被改变了。在当前上下文中,如果此时想直接通过赋值修改i的值,如: i=4;/* 编译报错,const修饰的变量量不能被赋值 */ 1. 编译: $ gccconst.cconst.c:In function ‘main’:const.c:15:7:...
the syntax for declaring const member functions:place the const specifier after the argument list If you declare a member function const, you tell the compiler the functioncan be called for a const object. A member function that is not specifically declared const is treated as one that will mo...
具現化以 D3D11_BUFFER_DESC 結構初始化之CD3D11_BUFFER_DESC結構的新實例。 語法 C++ 複製 void CD3D11_BUFFER_DESC( [ref] const D3D11_BUFFER_DESC & o ); 參數 [ref] o 類型: const D3D11_BUFFER_DESC 初始化CD3D11_BUFFER_DESC結構的D3D11_BUFFER_DESC結構位址。 ...
1 Answer byJnick Bernnet A "const function", denoted with the keyword const after a function declaration, makes it a compiler error for this class function to change a member variable of the class. However, reading of a class variables is ok inside of the function, but writing inside of ...
Before any function in a translation unit is executed (possibly after main began execution), the variables with static storage duration (namespace scope) in that translation unit will be "constant initialized" (to constexpr where possible, or zero otherwise), and then non-locals are "dynamically...
C4047警告信息在C/C++编程中经常出现,它通常表示函数调用时,形式参数(formal parameter)和实际参数(actual parameter)之间的间接级别(levels of indirection)不一致。这里的“间接级别”指的是指针的层数。 1. 解释C4047警告信息的含义 C4047警告表明,你在调用函数时,传递的参数类型与函数声明中指定的参数类型在指针的...
void function() const{} 通常我们会看到一些函数声明后面会跟着一个const,这个const是做什么的呢? 看一下下面的例子,就知道了。直接在编译前,就会提示下面的两个错误 // test1107.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include <iostream> ...
In C++, the const keyword is used to declare a variable or function parameter as read-only, indicating that its value cannot be modified after initialization. Once a value is assigned to a const variable, it cannot be changed, and any attempt to modify it will result in a compilation error...