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why use the costom copy string function?

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Started by derek7 May 22, 2005 10:09 AM

1 comment, last by Jemburula 18 years, 11 months ago

derek7

100

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May 22, 2005 10:09 AM

void CopyString(const char* input, char** output) { if( input ) { UINT length = (UINT)::strlen(input) + 1; // add 1 for terminating null charater. *output = new char[length]; ::strcpy(*output, input); } else { *output = 0; } } the stdio.h : strcpy() is not good or not work?

1,062

May 22, 2005 10:12 AM

The code you have is a function that wraps strcpy(). The difference is that the wrapper function automatically allocates memory for the new string, while a direct call to strcpy() needs to have the memory allocated for it.

Jemburula

341

May 22, 2005 05:46 PM

Copy constructor is also used alot for your own classes, it prevents a shallow copy such that when Object1 is copied by Object2 they aren't pointing to the same data in memory so that if Object1 were deleted, attempting to use Object2 results in a runtime error I think?
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