Re: [Boost-users] Boost.Variant broke in 1.54?

On 8/4/2013 8:57 AM, gast128 wrote:

Dear all,

I get a compilation error with Boost.Variant (which compiles fine on previous releases) with vstudio 2010 when a function returns a const Boost.Variant, e.g.:

typedef boost::variant Variant;

const Variant GetVar() { return Variant(); }

void TestVariantDnc() { const Variant var = GetVar(); }

This gives error C2666 ('boost::variant::convert_construct' : 3 overloads have similar conversions').

Shall a file a ticket or do I something wrong?

Returning a 'const X' is meaningless. Just return 'X' instead. The same goes for passing something as 'const X'. When you pass or return by value you get a copy of the object being passed so it means nothing to say that the object is 'const'.