Re: handle \x0 character in a string

From:
SG <s.gesemann@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Thu, 18 Dec 2008 04:20:37 -0800 (PST)
Message-ID:
<484b95a8-7833-48a7-aeb0-9135d32fe958@e1g2000pra.googlegroups.com>
On 18 Dez., 10:17, James Kanze <james.ka...@gmail.com> wrote:

The constuctor accepts char const*, not char*. And it's an
interesting question: why isn't there a template constructor:

    template< size_t l >
    string( char (&literal)[ l ] ) ;

? That would work here. (I've not verified the rules---maybe
it would be ambiguous with string::string( char const* ). Which
would still be needed in order to interface with C.)


I just checked it out of curiosity. In the presence of this templated
constructor

   string("hello")

would still invoke the constructor taking const char* as argument.
Apparently array-to-pointer decay is too little of a "conversion" to
make the compiler select a templated function over a non-templated
function. But if you convert the string(const char*) constructor to a
templated one with SFINAE a la

   template<typename T>
   string(const T*, typename enable_if_same<T,char,char>::type
dummy=0);

Then you get the desired behaviour.

Cheers!
SG

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