Binding to a class member with lambda::bind() can cause const qualifier mismatch.

[David Larsson <david.larsson@…>]

The following code (omitting namespaces) would compile correctly in Boost 1.43.0, but now fails with error boost/lambda/detail/function_adaptors.hpp(264) : error C2440 : 'return' : cannot convert from 'const int' to 'int &:

bind( &pair<int,int>::first, _1 )( make_pair( 1, 0 ) );

The boost::lambda::bind() expression creates a function that returns the first element of a pair, and then applies this to a const pair<int,int>. The following will work, because the argument is not constant:

pair<int,int> x(1,0);
bind( &pair<int,int>::first, _1 )( x );

A workaround for this issue is to specify the return value of bind() explicitly, but it shouldn't be necessary for this simple case:

bind<int>( &pair<int,int>::first, _1 )( make_pair( 1, 0 ) );

I have tested this on VC8 and VC10 with identical results.

Thanks for a great library,

/David

[David Larsson <david.larsson@…>]

Repro case

[Steven Watanabe]

(In [67640]) Fix return type deduction for pointers to data members. Fixes #4962. Fixes #4566.

[anonymous]

+1

[anonymous]

thanks? I correct my boost 1.44