Re: temporary object and const reference

From:
zade <zhaohongchao@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Wed, 14 Nov 2012 22:37:06 -0800 (PST)
Message-ID:
<6fe28127-621f-4025-a1bc-adb6948acd1e@googlegroups.com>
=E5=9C=A8 2012=E5=B9=B411=E6=9C=8815=E6=97=A5=E6=98=9F=E6=9C=9F=E5=9B=9BUTC=
+8=E4=B8=8B=E5=8D=882=E6=97=B609=E5=88=8635=E7=A7'=EF=BC=8CSaeed Amrollah=
i=E5=86=99=E9=81=93=EF=BC=9A

I
 
 
 
On Thursday, November 15, 2012 8:42:05 AM UTC+3:30, zade wrote:
 

codes like below:

 

 

 

// [[code begin]]

 

 

 

class Foo{

 

 

 

public:

 

 

 

 int i;

 

 

 

 Foo& operator=(const Foo&){

 

 

 

    return *this;

 

 

 

 }

 

 

 

};

 

 

 

 

 

 

 

void func(Foo&){

 

 

 

}

 

 

 

 

 

 

 

void test(){

 

 

 

  func(Foo() = Foo()); // compile ok

 

 

 

  func(Foo()); // compile error

 

 

 

}

 

 

 

// [[code end]]

 

 

 

 

 

 

 

 

 

 

 

Foo() generate a temporary object, which is a const reference object in=

 c++. so why func(Foo() = Foo()) compile ok but func(Foo()) compile erro=
r.

 
 
 
I compiled and ran your program under Visual Studio 2010.
 
There is no error message.
 
 
 
Regards,
 
  -- Saeed Amrollahi Boyouki


I use GCC 3.4.5

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