Re: Style: preferring parentheses to '=' for initialization?

"Noah Roberts" <>
27 May 2006 15:39:55 -0700
Tom=E1s wrote:

Alf P. Steinbach posted:

* Tom=E1s:

Alf P. Steinbach posted:

Assuming you're asking where would one use an explicit default
constructor call, e.g. like

   foo( std::string() + "Akka bakka " + someCString + "bonka rakka!" =


But we all know that the following would be favourable:

foo( std::string("Akka bakka ") + someCString + "bonka rakka!" );

Well no, I don't know that. ;-)

I just get this itch when I know something could be improved upon (even
when I know full well that the original poster knew what he/she was
doing!). I'm sure Victor would hate to see a "newbie" read your code and
then reproduce it. : )

I don't imagine there being a whole lot of difference between the two
versions. The have the same amount of temporaries, they call append
operation the same amount of times and with the same data...I just
really doubt there is any pragmatic difference between the two and if
there is it certainly isn't certain. For instance, a string could
easily be implemented in terms of:

string(const char * x) : whatever goes here to build a string... {
append(x); }

operator+(T t) { append(t); }

It couldn't just copy the pointer...if it where done that way, and that
is the most obvious, then it wouldn't matter if you did string() +
"xyz" or string("xyz").

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