What if one can''t wrap the local in an artificial block?, C/C++ Programming

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What if one can''t wrap the local in an artificial block?


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3/15/2013 5:35:15 AM

What if one can''t wrap the local in an artificial block?

A: Mostly time, one can limit the lifetime of a local via wrapping the local in an artificial block ({...}). But if for some cause you can''t do that, add a member function which has a similar effect as the destructor. Although do not call the destructor itself!

For instance, in the case of class File, you may add a close() method. The destructor typically will simply call this close() method. Note down that the close() method will have to mark the File object so a subsequent call won''t re-close an already-closed File. For example it might set the fileHandle_ data member to some nonsensical value like -1, and it may check at the starting to see if the fileHandle_ is already equal to -1:

 

class File {

public:

void close();

~File();

... private:

int fileHandle_; // fileHandle_ >= 0 if/only-if it''s open

};

File::~File()

{

close();

}

void File::close()

{

if (fileHandle_ >= 0) {

...insert code to call the OS to close the file... fileHandle_ = -1;

}

}

Note down that the other File methods might also have to check if the fileHandle_ is -1 (that mean., check if the File is closed).

Note down  also that any constructors that don''t actually open a file should set fileHandle_ to -1.

 

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