Fix sstream/strstream (and config.h) compiler issues.

Code would not compile with HAVE_STRSTREAM defined.

Code would not compile without HAVE_CONFIG_H defined (unless
-DHAVE_STRSTREAM or -DHAVE_SSTREAM was specified).

Code would not compile with HAVE_CONFIG_H defined if config.h did not
also define HAVE_SSTREAM.

This patch moves annoying logic for sstream/strstream logic to it's
own file and fixes the above mentioned issues.

https://sourceforge.net/p/tclap/bugs/23/

include/tclap/Arg.h

@@ -6,6 +6,7 @@
  *
  *  Copyright (c) 2003, Michael E. Smoot .
  *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno .
+ *  Copyright (c) 2017 Google Inc.
  *  All rights reserved.
  *
  *  See the file COPYING in the top directory of this distribution for
@@ -27,8 +28,6 @@
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
-#else
-#define HAVE_SSTREAM
 #endif
 
 #include <string>
@@ -38,6 +37,8 @@
 #include <iomanip>
 #include <cstdio>
 
+#include <tclap/sstream.h>
+
 #if defined(HAVE_SSTREAM)
 #include <sstream>
 typedef std::istringstream istringstream;
@@ -415,7 +416,7 @@ template<typename T> void
 ExtractValue(T &destVal, const std::string& strVal, ValueLike vl)
 {
     static_cast<void>(vl); // Avoid warning about unused vl
-    std::istringstream is(strVal);
+    istringstream is(strVal.c_str());
 
     int valuesRead = 0;
     while ( is.good() ) {

include/tclap/ValuesConstraint.h

@@ -23,23 +23,14 @@
 #ifndef TCLAP_VALUESCONSTRAINT_H
 #define TCLAP_VALUESCONSTRAINT_H
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <string>
 #include <vector>
 #include <tclap/Constraint.h>
-
+#include <tclap/sstream.h>
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#else
-#define HAVE_SSTREAM
-#endif
-
-#if defined(HAVE_SSTREAM)
-#include <sstream>
-#elif defined(HAVE_STRSTREAM)
-#include <strstream>
-#else
-#error "Need a stringstream (sstream or strstream) to compile!"
-#endif
 
 namespace TCLAP {
 

include/tclap/ZshCompletionOutput.h

@@ -5,6 +5,7 @@
  *  file:  ZshCompletionOutput.h
  * 
  *  Copyright (c) 2006, Oliver Kiddle
+ *  Copyright (c) 2017 Google Inc.
  *  All rights reserved.
  * 
  *  See the file COPYING in the top directory of this distribution for
@@ -23,6 +24,10 @@
 #ifndef TCLAP_ZSHCOMPLETIONOUTPUT_H
 #define TCLAP_ZSHCOMPLETIONOUTPUT_H
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <string>
 #include <vector>
 #include <list>
@@ -33,6 +38,7 @@
 #include <tclap/CmdLineOutput.h>
 #include <tclap/XorHandler.h>
 #include <tclap/Arg.h>
+#include <tclap/sstream.h>
 
 namespace TCLAP {
 
@@ -284,7 +290,7 @@ inline std::string ZshCompletionOutput::getMutexList( CmdLineInterface& _cmd, Ar
 		return "(-)";
 	}
 
-	std::ostringstream list;
+	ostringstream list;
 	if ( a->acceptsMultipleValues() )
 	{
 		list << '*';

include/tclap/sstream.h

@@ -0,0 +1,50 @@
+// -*- Mode: c++; c-basic-offset: 4; tab-width: 4; -*-
+
+/******************************************************************************
+ *
+ *  file:  sstream.h
+ *
+ *  Copyright (c) 2003, Michael E. Smoot .
+ *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno .
+ *  Copyright (c) 2017 Google Inc.
+ *  All rights reserved.
+ *
+ *  See the file COPYING in the top directory of this distribution for
+ *  more information.
+ *
+ *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ *  DEALINGS IN THE SOFTWARE.
+ *
+ *****************************************************************************/
+
+#ifndef TCLAP_SSTREAM_H
+#define TCLAP_SSTREAM_H
+
+#if !defined(HAVE_STRSTREAM)
+// Assume sstream is available if strstream is not specified
+// (https://sourceforge.net/p/tclap/bugs/23/)
+#define HAVE_SSTREAM
+#endif
+
+#if defined(HAVE_SSTREAM)
+#include <sstream>
+namespace TCLAP {
+    typedef std::istringstream istringstream;
+    typedef std::ostringstream ostringstream;
+}
+#elif defined(HAVE_STRSTREAM)
+#include <strstream>
+namespace TCLAP {
+    typedef std::istrstream istringstream;
+    typedef std::ostrstream ostringstream;
+}
+#else
+#error "Need a stringstream (sstream or strstream) to compile!"
+#endif
+
+#endif  // TCLAP_SSTREAM_H