* ios:nocreate
@ 2002-09-27 10:30 Yu-Lun Chen
2002-09-27 12:09 ` ios:nocreate John Love-Jensen
0 siblings, 1 reply; 3+ messages in thread
From: Yu-Lun Chen @ 2002-09-27 10:30 UTC (permalink / raw)
To: gcc-help
Hi,
While upgrading from g++ 2.95.3 to 3.2, I encounter the following
problem. For some reason, the old ios:nocreate mode for the open()
method in ifstream is no longer supported. Is there a work around for
this? Thanks in advance!
Yu-Lun Chen <----------------------------> yu-lun@marc.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ios:nocreate
2002-09-27 10:30 ios:nocreate Yu-Lun Chen
@ 2002-09-27 12:09 ` John Love-Jensen
2002-09-27 12:33 ` ios:nocreate John Love-Jensen
0 siblings, 1 reply; 3+ messages in thread
From: John Love-Jensen @ 2002-09-27 12:09 UTC (permalink / raw)
To: yu-lun, gcc-help
Hi Yu-Lun,
The ios::nocreate setting did not make it into the ISO 14882:1998 C++
standard. Too platform specific.
You can simulate that behavior with:
fstream foo("foo.txt", ios_base::in);
if(!fs) {
// File does not exist.
// Do not create one.
}
else {
foo.close();
foo.open("foo.txt", ios_base::out);
}
Note: the ios::xxxxx settings are from the defunct <fstream.h> header file.
While the ios_base::xxxxx are from the <fstream> (notice, no .h suffix)
header file, within the std namespace.
--Eljay
^ permalink raw reply [flat|nested] 3+ messages in thread
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