Re: g++ 2.7.0: bool vs. string vs. const char* overloading

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Article #814

#814

From: Alex Martelli
Date: Thu, 02 Nov 1995 22:52

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abraham@dina.kvl.dk (Per Abrahamsen) writes:
	...
>Can anyone explain to me why two doIt calls below select different
>overloaded functions?
	...
>void doIt (string)
	...
>void doIt (bool)
	...
>  const char* const cp = "Hi!";
>  doIt (cp);
>  doIt ("Hi!");

There is no conversion from a const char* to a non-const string,
while there is one from any pointer to bool, so the first call
will surely end up calling doIt(bool).  The literal "Hi!" is
a (non-const) char* (for historical reasons) -- I confess I'm
not sure why the user-defined conversion to string is
unambiguously preferred to the builtin one to bool (perhaps
the latter would have to go through a _const_ char*...?)

Alex
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Path: arc1-ca.pugleaf.net!sirio.cineca.it!cadlab!martelli
From: martelli@cadlab.cadlab.it (Alex Martelli)
Newsgroups: gnu.g++.help,comp.lang.c++
Subject: Re: g++ 2.7.0: bool vs. string vs. const char* overloading
Date: Thu, 2 Nov 1995 22:52:12 GMT
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