psxgas@cs.nott.ac.uk (Alan Shepherd) (08/01/88)
Does anyone know how to use the OOPS Strings in standard C++ routines which take char* parameters eg. filebuf.open(char*, {input,output}) ? The manual says that the operator const char*() should do the trick, but this has been commented out of the code and marked 'cfront bug'. The replacement, operator constCharPtTy() doesn't seem to work either. Normal casting i.e. filebuf.open((char*) &String_name, input) compiles fine, but doesn't perform as expected. For the time being, I've adopted the following solution : filebuf.open((char*) (String_name(0,String_name.length()).ptr()),input); This uses the substring class method ptr() which returns a const char* by converting the string into a substring using the SubString operator()(pos,len) . Thanks for any help, Alan Shepherd
krohn@u1100a.UUCP (Eric Krohn) (08/09/88)
In article <2859@robin.cs.nott.ac.uk> psxgas@nott-cs.UUCP writes:
] Does anyone know how to use the OOPS Strings in standard C++ routines which
] take char* parameters
]
] For the time being, I've adopted the following solution :
]
] filebuf.open((char*) (String_name(0,String_name.length()).ptr()),input);
That's rather ugly! I've used both of the following
&String_name[0]
and
str2str (String_name)
where str2str is defined as:
static const char *str2str (const char *str) { return (str); }
Both expressions have type const char *.
String_name is, of course, declared to be of type String.
--
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Eric J. Krohn
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