[boost] lambda: missing result deduction

From: David Abrahams (dave_at_[hidden])
Date: 2004-09-01 21:05:27

I had to add this to get some tests for the TMP book to pass:

    namespace boost { namespace lambda {
      template<int N> 
      struct
      plain_return_type_2<arithmetic_action<plus_action>, char[N], std::string> {
         typedef std::string type;
      };
    }} // namespace boost::lambda

Obviously this could be generalized for basic_string and for the
reversed arguments.  I assume it's not in the library because it
forces you to #include <string>?  Maybe there should be a special
lambda header for each std:: type that needs deduction help?

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com