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Bookmark or Share- Does using const on function parameters have any effect? Why does it ...const is pointless when the argument is passed by value since you will not be modifying the caller's object. const should be preferred when passing by reference, unless the purpose of the function is to modify the passed value. Finally, a function which does not modify current object (this) can, and probably should be declared const.
- 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.
- Why can we use `std::move` on a `const` object? - Stack OverflowThe reason we have const keyword in the language is that we want the compiler to prevent any change to an object defined to be const. Given the example in Scott Meyers' book: class Annotation { public: explicit Annotation(const std::string text) : value(std::move(text)) // "move" text into value; this code { … } // doesn't do what it seems to!
- Const in JavaScript: when to use it and is it necessary?The const keyword currently declares the constant in the function scope (like variables declared with var). It then goes on to say: const is going to be defined by ECMAScript 6, but with different semantics. Similar to variables declared with the let statement, constants declared with const will be block-scoped.
- constants - What does 'const&' mean in C++? - Stack Overflowint 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 absolutely equivalent.
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