Artificial block, C/C++ Programming

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What if I cannot wrap the local in an artificial block? need help on Artificial Block in c++.

 


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Oscar

2/13/2013 2:08:08 AM

Artificial block

Several times, you can limit the lifetime of a local by wrapping the local in an artificial block ({...}). But if for a number of reasons you cannot do that, add a member function that has a similar effect as the destructor. But do not call the destructor itself!  

For example, in the case of class File, you might add a close() method. Usually the destructor will simply call this close() method. Note that the close() method will need 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 might check at the beginning 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 that the other File methods may also need to check if the fileHandle_ is -1 (i.e., check if the File is closed).  Note also that any constructors that don''t actually open a file should set file Handle_ to -1.

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