Re: Do I need a singleton here? RESOLVED

"Jim Langston" <>
Thu, 21 Oct 2010 22:21:54 -0700
"Luc Danton" <> wrote in message

On 22/10/2010 07:00, Jim Langston wrote:

I just tried it out and it seems that in Express 2010 anyway my concern
was justified. Without an operator=(&&) this will not compile (as it

world.fonts[L"Normal"] = jmlGL::jglFont( hDC, L"Courier New", 24 );
error C2248: 'jmlGL::jglFont::operator =' : cannot access private member
declared in class 'jmlGL::jglFont'

However, when I add
jglFont& operator=(jglFont&& rhs) { /*.real code here..*/ }

my program compiles and runs. I did not have to use std::move.

But jglFont is your type, so the expression jmlGL::jglFont( hDC, L"Courier
New", 24 ) is a constructor call that results in an rvalue of this type,

What you need to check is:
jglFont lval = /* whatever */;
jglFont destination; /* or another init if not DefaultConstructible */
destination = lval;

You are correct. This will not compile:
world.fonts[L"Normal"] = world.fonts[L"Bold"];
error C2248: 'jmlGL::jglFont::operator =' : cannot access private member
declared in class 'jmlGL::jglFont'

Okay. I think I understand. If the object being assigned from is a
temporary operator=(&&) will be called. If it's not a temporary then
operator=(&) will be called.

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