Re: Enkel voor C++ gurus

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#5857

From: Simon Vandemoortele
Date: Thu, 06 Feb 2003 21:00

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Heb uiteindelijk antwoord gevonden op 
'http://gcc.gnu.org/bugs.html#known: Parse errors for "simple" code'

[snip]

Another example is the parse error for the return statement in

struct A{};

struct B{
  A a;
  A f1(bool);
};

A B::f1(bool b)
{
  if (b)
    return (A());
  return a;
}

The problem is that the compiler interprets A() as a function (taking no
arguments, returning A), and (A()) as a cast - with a missing
expression, hence the parse error. The work-around is to omit the
parentheses:

if (b)
  return A();

This problem occurs in a number of variants; in throw statements, people
also frequently put the object in parentheses. The exact error also
somewhat varies with the compiler version. The work-arounds proposed do
not change the semantics of the program at all; they make them perhaps
less readable.

[einde]


Voila, zo weten we het.


Bedankt voor de antwoorden,
Simon


-- 
Two wrights don't make a rong, they make an airplane.  Or bicycles.

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From: Simon Vandemoortele <deliriousNOSPAM@atchoo.be>
Subject: Re: Enkel voor C++ gurus
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