Mail Archives: djgpp/1998/01/18/13:00:36
| From: | NOSPAMsl AT psycode DOT com (Gili)
|
| Newsgroups: | comp.os.msdos.djgpp,gnu.gcc.help,comp.os.os2.programmer.misc
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| Subject: | C++ constructor problem solved!! Read how, it might come in useful in your future programs!
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| Date: | 18 Jan 1998 17:37:22 GMT
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| Organization: | Generation.NET
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| Lines: | 30
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| Message-ID: | <bWLoegW7sFse-pn2-bxyqvlUyVUyY@localhost>
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| Reply-To: | NOSPAMsl AT psycode DOT com
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| NNTP-Posting-Host: | portC59.Generation.NET
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| Mime-Version: | 1.0
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| To: | djgpp AT delorie DOT com
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| DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
|
Here is a quick review of the problem:
File() is a class which inherites publicly from fstream() (in other
words, "class File : public fstream")
We want to be able to call the base constructor of fstream() when the
constructor of File() is called. We know we can do this in this
fashion:
File::File(<parameters>):
fstream(<parameters>)
{
<body goes here>
}
However, we wanted to be able to call the base constructor from the
body of the File() constructor. This would allow more flexibility,
mainly allowing you to use exception-handling for this call. The
solution took me 2 days to find, but here it is:
File::File(<parameters>)
{
((fstream*)this)->fstream(<parameters>);
<body goes here>
}
Many thanks to Peter Nielsen and Calvin French for their help...
Gili
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