Unable to compile boost / any_iterator.hpp in boost 1.57

Question

After (trying) updating the VS2012 project to use boost 1.57, I can no longer compile - many, many error messages coming out of boost/any_iterator.hpp (see below). As a test, I created a new project that contains only the empty main function and #include "boost/any_iterator.hpp" and got the same set of errors. Here is the code he complains about:

 // snippet from boost/any_iterator.hpp template< class Value , class Traversal , class Reference , class Difference , class Buffer > class postfix_increment_proxy< range_detail::any_iterator< // line 131 Value , Traversal , Reference , Difference , Buffer > > { // ... }; 

There is another class in the same file that follows the same pattern and generates identical errors. range_detail::any_iterator declared forward in the file a little higher:

 namespace range_detail { // ... template< class Value , class Traversal , class Reference , class Difference , class Buffer = any_iterator_default_buffer > class any_iterator; // ... } 

For what it's worth, here is the set of errors that I get from VS2012:

 Error 1 error C2143: syntax error : missing ';' before '<' [path]\boost\range\detail\any_iterator.hpp 131 Error 2 error C2059: syntax error : '<' [path]\boost\range\detail\any_iterator.hpp 131 Error 3 error C2065: 'Value' : undeclared identifier [path]\boost\range\detail\any_iterator.hpp 134 Error 4 error C2065: 'Traversal' : undeclared identifier [path]\boost\range\detail\any_iterator.hpp 135 Error 5 error C2065: 'Reference' : undeclared identifier [path]\boost\range\detail\any_iterator.hpp 136 Error 6 error C2065: 'Difference' : undeclared identifier [path]\boost\range\detail\any_iterator.hpp 137 Error 7 error C2065: 'Buffer' : undeclared identifier [path]\boost\range\detail\any_iterator.hpp 138 Error 8 error C2923: 'boost::range_detail::any_iterator' : 'Value' is not a valid template type argument for parameter 'Value' [path]\boost\range\detail\any_iterator.hpp 138 Error 9 error C2923: 'boost::range_detail::any_iterator' : 'Traversal' is not a valid template type argument for parameter 'Traversal' [path]\boost\range\detail\any_iterator.hpp 138 Error 10 error C2923: 'boost::range_detail::any_iterator' : 'Reference' is not a valid template type argument for parameter 'Reference' [path]\boost\range\detail\any_iterator.hpp 138 Error 11 error C2923: 'boost::range_detail::any_iterator' : 'Difference' is not a valid template type argument for parameter 'Difference' [path]\boost\range\detail\any_iterator.hpp 138 Error 12 error C2923: 'boost::range_detail::any_iterator' : 'Buffer' is not a valid template type argument for parameter 'Buffer' [path]\boost\range\detail\any_iterator.hpp 138 Error 13 error C2143: syntax error : missing ';' before '{' [path]\boost\range\detail\any_iterator.hpp 140 Error 14 error C2447: '{' : missing function header (old-style formal list?) [path]\boost\range\detail\any_iterator.hpp 140 

Does anyone know of a workaround?

Answer 1

This is apparently a bug in the boost codebase. postfix_increment_proxy and writable_postfix_increment_proxy are in the namespace boost::iterators::detail (iterator_facade.hpp). However, both names are used by unqualified people in any_iterator.hpp. Adding boost::iterators::detail:: in front of both names allows you to compile the code.

For those who are not comfortable with the idea of ​​editing promotion code, including iterator_facade.hpp, followed by using namespace boost::iterators::detail , followed by include for any_iterator.hpp, this will also fix the problem by polluting the namespace. VS2012 does not support them, so it does not bring me any benefit, but you probably use C ++ 11 too.

Presented ticket: https://svn.boost.org/trac/boost/ticket/10754