Re: [Boost-users] variant warnings?

From: hfye-wila_at_[hidden]
Date: 2008-07-23 11:26:52

As recommended (thanks Steve!), I have disabled VC9's C4512 warning to get a
canonical Boost.Variant example to compile (in VC9) without warnings:

#pragma warning( push )
#pragma warning( disable : 4512 )
#include <boost/variant.hpp>
#pragma warning( pop )
#include <iostream>
using namespace std;

struct vis : public boost::static_visitor<> {
    void operator()( int & ) const { cout << "int" << endl; }
    void operator()( string & ) const { cout << "string" << endl; }
};

int main( int, char * ) {
    boost::variant< int, string > v;
    boost::apply_visitor( vis(), v );
    return 0;
}

*If* this warning is truly harmless, should this be considered a bug in
Boost.Variant?  Shouldn't Boost.Variant disable benign warnings in a
compiler-independent way?  Or at least shouldn't the Boost.Variant docs be
updated?  Or is this warning part of Boost.Variant's design?  If so is there
any way I can change my code above to compile without warnings other without
explicitly suppressing warnings?

Any Boost.Variant authors/maintainers care to comment?

John Fearnside

-----Original Message-----
AMDG

hfye-wila_at_[hidden] wrote:
> Does Boost.Variant require certain warnings to be disabled?  The following
program generates a warning for me with VC9:
>   

Warning 4512 is almost always harmless.  It's usually caused
by structs containing reference members.  You're best off disabling
it.

In Christ,
Steven Watanabe