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This article mainly introduces "the pointer example analysis of passing reference constant by default in C++". In daily operation, I believe that many people have doubts about passing reference constant pointer to analyze problems by default in C++. The editor consulted all kinds of data and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for everyone to answer the doubt that "the pointer of reference constant is passed by default in C++". Next, please follow the editor to study!

Con.3: by default, pass pointers or references to reference constants

Reason (reason)

To prevent the called function from accidentally modifying the value of the variable. This makes it easier for the program to understand when the called function does not change the state.

Example (sample)

Void f (char* p); / / does f modify * p? (assume it does)

Void g (const char* p); / / g does not modify * pNote (note)

It's not necessarily bad to pass a pointer or reference to a non-constant, but it's best to do so only if the called function modifies the object.

Note (Note)

Do not cast away const

Do not perform conversions that remove the const attribute

Enforcement (Note)

Flag function that does not modify an object passed by pointer or reference to non-const

If the function does not modify the non-constant pointer or the referenced object, mark it.

Flag a function that (using a cast) modifies an object passed by pointer or reference to const

If the function uses const type conversion to modify the constant pointer or reference the referenced object, mark it.

At this point, on the "C++ by default transfer reference constant pointer example analysis," the study, I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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