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  • constants - What does const mean in C++? - Stack Overflow
    int* const is a const pointer to a [non-const] int; int const* is a [non-const] pointer to a const int; int const* const is a const pointer to a const int; For whatever unfortunate accident in history, however, it was found reasonable to also allow the top-level const to be written on the left, i e , const int and int const are
  • C++ const 和 constexpr 的区别？ - 知乎
    const：用来限制变量不能修改，值可以在运行时确定。是运行时常量。constexpr：要求编译期确定值，编译器在编译阶段计算值。是编译期常量。从本质上来说，constexpr 是更严格的 const。一个 constexpr 值一定是 const，但 const 值不一定是 constexpr。4
  • What is the difference between const int*, const int * const, and int . . .
    const int *p;: When p is dereferenced with *, the expression is of type const int Therefore, p is a pointer to const int int *const p;: p is const If this constant expression is dereferenced with *, the expression is of type int Therefore, p is a const pointer to int const int *const p;: p is const
  • c++ - What is the meaning of const at the end of a member function . . .
    The method bar() is non-const and can only be accessed from non-const values void func1(const foobar fb1, foobar fb2) { const char* v1 = fb1 bar(); won't compile const char* v2 = fb2 bar(); works } The idea behind const though is to mark methods which will not alter the internal state of the class This is a powerful concept but is not
  • What is the difference between const and const {} in JavaScript?
    const email = obj email; const title = obj title; This is old school now We can use ES6 destructuring assignment, i e , if our object contains 20 fields in the obj object, then we just have to write names of those fields which we want to use like this:
  • C语言函数中用const 定义的常量是存放在内存的静态存储区 . . .
    我受不了了啊，一个个都是纸上谈兵的啊，都不能动动手看一下汇编的啊 简单情况下的 const 整型（直接赋字面量或者通过简单运算得出来的，有时候编译器优化能力强甚至可以带一点简单函数调用），一般都是“真”编译期常量，可以对标 C++ 里的 constexpr，优化成汇编里的立即数：
  • C++里 const int* 与 int const* 有什么区别？ - 知乎
    这个const的左边是*，所以const作用于指针（不可改变指向的地址），所以这是a constant pointer to an integer，可以通过指针改变其所指向的内容但只能指向该地址，不可指向别的地址。const int* const 这里有两个const。左边的const 的左边没东西，右边有int
  • c++ - Is there const in C? - Stack Overflow
    A top-level declaration that has the type qualifier const but no explicit storage class is considered to be static in C++ but extern in C To remain compatible, examine top-level const declarations and provide an explicit storage class In C++, string constants are implicitly const; they are not in C
  • 在c++代码中使用const关键字是不是自找麻烦？ - 知乎
    所以 const int 作为函数参数，是能够承载 3 这种常量输入的，而 int 就只能承载一个变量，无法承载3这个数字。类似的，const char * 是能够承载 "hello world" 这种常量的（字符串常量指向的是不可修改的常量区域）。





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