Re: [boost] Boost 1_58_0_b1_rc2 is available for testing

Subject: Re: [boost] Boost 1_58_0_b1_rc2 is available for testing
From: Peter Dimov (lists_at_[hidden])
Date: 2015-03-14 17:51:45

Marcel Raad wrote:
> I get a lot of compile errors on MSVC12 when using boost::bind with more 
> than two arguments of which one is a non-const reference and constructing 
> a boost::function with the result:
>
> #include <boost/bind.hpp>
> #include <boost/function.hpp>
>
> void a(int&, int, int);
>
> int main(){
>  boost::function<void(int&, int, int)>
>   f(boost::bind(&a, _1, _2, _3));
> }
>
> results in
> error C2664: 'void (int &,int,int)': cannot convert argument 1 from 'const 
> int' to 'int &'

Good one.

This regression is caused by the following change to boost::function:

https://github.com/boostorg/function/commit/27e9e1e372df203186a9e89e887a4e10dc4fa70f

You can verify that by adding

#include <boost/config.hpp>
#define BOOST_NO_CXX11_RVALUE_REFERENCES

at the top of the source file.

An example that doesn't use boost::bind is:

int main()
{
    boost::function<void(int, int, int)> f2( &a );
}

This, too, worked before the change and doesn't now.