c++/339: Parse error on constructor call

[matt_conway@i2.com]

>Number:         339
>Category:       c++
>Synopsis:       Parse error on constructor call
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 20 14:56:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     matt_conway@i2.com
>Release:        gcc/g++ snapshot 20000612
>Organization:
>Environment:
i686-pc-linux
>Description:
G++ has problems parsing a call to a constructor when the arguments for the ctor are produced by a chain of other method calls.  See the code in the How-To-Repeat section for an example.
>How-To-Repeat:
Compile the following code with "g++ -g -c":

class Bar
{
public:
	Bar& baz() {return *this;}
	Bar& baz2() {return *this;}
	void bar();
	void bar2(const Bar& b) {}
};

class Foo
{
public:
	Foo(const Bar& b) {}
	void foo() {}
};

void Bar::bar()
{
	bar2(baz().baz2());
	Foo foovar(baz().baz2());

	// These three give a parse error
	Foo(baz().baz2()).foo();
	Foo(baz()).foo();
	Foo(baz().baz2());
	// This one works
	Foo(baz());
}
>Fix:
Have an intermediary reference variable, e.g:
Bar&b = baz().baz2();
Foo(b).foo();
>Release-Note:
>Audit-Trail:
>Unformatted: