to pass by

Key points of this article:1, try to replace Pass-by-value with Pass-by-reference-to-const. The former is more efficient and can avoid cutting problems.2. This rule does not apply to both the built-in type and the iterator and function object types

Effective C + + ' ning to pass-by-reference-to-const replace Pass-by-value 'By default, C + + passes an object to a function by value (a way that inherits from C). Unless you specify otherwise, the function parameter is the initial value of the

First of all, theparameters of all functions in JavaScript are passed by value! There is no pass by reference! in speaking of passing Parameters let's start with pointers. Learn the C pointer should know that the pointer variable is stored in an

clause 20: Prefer to replace pass-by-value with Pass-by-reference-to-const By default, C + + passes objects to (or from) functions in by value, a way that inherits from C. Unless you specify otherwise, the function arguments are based on the actual

Effective C + + ' ning to pass-by-reference-to-const replace Pass-by-value 'By default, C + + passes an object to a function by value (a way that inherits from C). Unless you specify otherwise, the function parameter is the initial value of the

"Effective C + +"Clause 20: Prefer to replace pass-by-value with Pass-by-reference-to-constBy default, C + + passes an object to a function by value. Unless you know otherwise, the function parameter is the initial value of the copy of the actual

Key points: Try to replace pass-by-reference-to-const with pass-by-value. This is usually more efficient and avoids the problem of object cutting when the subclass object is copied to the base class. Pass-by-value should be used for the internal

   Replace pass-by-value (prefer pass-by-conference-to-const) with pass-by-reference-to-Const. To pass-by-value .) Pass-by-conference-to-const: ClassPoint { Public: Point(): Xval (2), yval (2 ){Printf("% D, % d/N", xval, yval );} Void Setxval(IntI) {

(1) If the pass-by-value parameter is passed when a function is called, the function parameters take the actual copy of the real parameter as the initial value, and the call end obtains a replica of the function return value. See the following code:

By default, C ++ uses the by Value Method to pass the object (or from) function. The function parameter is the initial value of the copy of the real parameter, and the result obtained by the function is also a copy of the function return value.