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Ryjek
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 Posted: Wed Dec 24, 2003 10:50 pm Post subject: Type conversions of string literals |
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The following piece of code compiles on some compilers
(VC++6.0,Intel,SGI's CC,Comeau), but fails on others (gcc,HP's aCC). Is
this code valid ?
struct Text {
Text( const char (&str)[2] ) {}
};
void f( Text a, ... ) {}
int main()
{
Text a("a"); // ok
f("a"); // gcc error: conversion from "const char *"
// to non-scalar type "Text"
return 0;
}
Any idea how to work around the compilation error ? I would like to
allow only string literals to be passed as the first argument to f().
TIA
Ryjek
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Ron Natalie
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| Posted: Fri Dec 26, 2003 12:55 pm Post subject: Re: Type conversions of string literals |
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"Ryjek" <ryjek (AT) cox (DOT) net> wrote
| Quote: | Any idea how to work around the compilation error ? I would like to
allow only string literals to be passed as the first argument to f().
|
There's no good way to do that. A string literals not easily distinguishable
from a const char array. Even if you got around your compile bugs above
it wouldn't do what you say.
You could use a little syntactic fudge:
#define f(x) realf("" x "")'
void realf(const char*);
f("foo"); // calls realf("foo");
const char a[2];
f(a); // syntax error !
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