Missing header file in type_erasure/exception.hpp causes several tests in type_erasure to fail

[Aparna Kumta <aparna.kumta@…>]

Compiling with Oracle Solaris Studio 12.4 on Solaris11.2, several type_erasure tests fail as follows:

"../boost/type_erasure/exception.hpp", line 29: Error: Could not find std::invalid_argument::invalid_argument(const char[18]) to initialize base class. "../boost/type_erasure/exception.hpp", line 29: Error: Could not find a match for std::invalid_argument::invalid_argument(boost::type_erasure::bad_function_call, const char[18]) needed in boost::type_erasure::bad_function_call::bad_function_call().

Adding <string> header file to boost/type_erasure/exception.hpp seems to resolve the issue.

% diff ./exception.hpp_orig exception.hpp 15a16

#include <string>

%

[Steven Watanabe]

Duplicates #11078