fix reference to stringstream used in error message.

cppad/local/forward.hpp

@@ -205,13 +205,18 @@ VectorBase ADFun<Base>::Forward(
 			"to binary a file.\n"
 			"vector_size = " << n << "\n" <<
 			"file_name = " << file_name << "\n";
-			const char* msg = ss.str().c_str();
+			// ss.str() returns a string object with a copy of the current 
+			// contents in the stream buffer.
+			std::string msg_str       = ss.str();
+			// msg_str.c_str() returns a pointer to the c-string 
+			// representation of the string object's value. 
+			const char* msg_char_star = msg_str.c_str();
 			ErrorHandler::Call(
 				true,
 				__LINE__,
 				__FILE__,
 				"! CppAD::isnan( yq[ (q+1) * i + 0 ] )",
-				msg
+				msg_char_star
 			);
 		}
 		CPPAD_ASSERT_KNOWN(ok,

cppad/local/fun_construct.hpp

@@ -488,9 +488,15 @@ ADFun<Base>::ADFun(const VectorAD &x, const VectorAD &y)
 		    << "Difference               = " 
 		    <<  y[i].value_ -  taylor_[dep_taddr_[i]]  << endl
 		;
+		// buf.str() returns a string object with a copy of the current 
+		// contents in the stream buffer.
+		std::string msg_str       = buf.str();
+		// msg_str.c_str() returns a pointer to the c-string 
+		// representation of the string object's value. 
+		const char* msg_char_star = msg_str.c_str();
 		CPPAD_ASSERT_KNOWN(
 			0,
-			buf.str().c_str()
+			msg_char_star
 		);
 	}
 # endif

cppad/thread_alloc.hpp

@@ -1018,7 +1018,13 @@ that $icode v_ptr$$ is in the list.
 			oss << "capacity = " << capacity << endl;
 			oss << "See CPPAD_TRACE_THREAD & CPPAD_TRACE_CAPACITY in";
 			oss << endl << "# include <cppad/thread_alloc.hpp>" << endl;
-			CPPAD_ASSERT_KNOWN(false, oss.str().c_str()	);
+			// oss.str() returns a string object with a copy of the current 
+			// contents in the stream buffer.
+			std::string msg_str       = oss.str();
+			// msg_str.c_str() returns a pointer to the c-string 
+			// representation of the string object's value. 
+			const char* msg_char_star = msg_str.c_str();
+			CPPAD_ASSERT_KNOWN(false, msg_char_star );
 		}
 
 		// trace option

omh/whats_new/whats_new_15.omh

@@ -75,6 +75,14 @@ This section contains a list of the changes to CppAD during 2015
 The purpose of this section is to
 assist you in learning about changes between various versions of CppAD.
 
+$head 11-14$$
+There was a bug in the new
+$cref/get_check_for_nan/check_for_nan/get_check_for_nan/$$
+feature that writes independent variable values to a temporary file;
+see $cref/11-06/whats_new_15/11-06/$$ below.
+This has been fixed.
+
+
 $head 11-08$$
 $list number$$
 Fixed a bug in the $cref RevSparseJac$$ routine.