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
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
There are many questions about this.ProgramThey do not understand and are often used in routine programming. For example, I declared a variable in the external body of the method, and then I thought of a change in the body of the method.
Preface:We've all used the value-passing method of C, so how does the value transfer work in C + + cases?Like what:int foo (int x); int I;foo (i);1. Get a copy of I within the program2. Passing a copy to the Foo function3.foo backThese replicas are
Does JS pass by value or by reference?Recently I encountered an interesting question: "Is the value in JS passed by value or by reference ?" Before analyzing this problem, we need to know what is call by value and call by reference ). In computer
Replace Pass-by-value with Pass-by-reference-to-const as much as possible. The former is usually more efficient because it avoids the call to copy constructors and destructors, and avoids cutting problems.is a good example of slicing problems:
Reading Notes effctive c ++ Item 20 is preferentially transmitted by const-reference (by-reference-to-const) instead of by value (by value), constreference1. Passing parameters by value will be efficient
By default, C ++ transfers objects to or from
This article mainly describes the go in the end there is no reference to the parameters (compared to C + +), the need for friends can refer to the following
Three ways to pass parameters in C + +
One of the most common ways to pass a
For the understanding of a language, will care about when we call the function, the parameter is the value of the pass, or reference?
In fact, for the transfer of value and reference, is a relatively old topic, do research and development have this
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