Make common interface to shared_ptr available

Use configure-time checks to find an available implementation of shared_ptr from
the standard library (C++11), TR1 (C++03), or Boost.

SConstruct

@@ -794,6 +794,8 @@ def get_expression_value(includes, expression):
               '}\n'))
     return '\n'.join(s)
 
+configh = {}
+
 env['HAS_TIMES_H'] = conf.CheckCHeader('sys/times.h', '""')
 env['HAS_UNISTD_H'] = conf.CheckCHeader('unistd.h', '""')
 #
@@ -814,6 +816,22 @@ boost_version_source = get_expression_value(['<boost/version.hpp>'], 'BOOST_LIB_
 retcode, boost_lib_version = conf.TryRun(boost_version_source, '.cpp')
 env['BOOST_LIB_VERSION'] = boost_lib_version.strip()
 
+# Find shared pointer implementation
+configh['CT_USE_STD_SHARED_PTR'] = None
+configh['CT_USE_TR1_SHARED_PTR'] = None
+configh['CT_USE_MSFT_SHARED_PTR'] = None
+configh['CT_USE_BOOST_SHARED_PTR'] = None
+if conf.CheckStatement('std::shared_ptr<int> x', '#include <memory>'):
+    configh['CT_USE_STD_SHARED_PTR'] = 1
+elif conf.CheckStatement('std::tr1::shared_ptr<int> x', '#include <tr1/memory>'):
+    configh['CT_USE_TR1_SHARED_PTR'] = 1
+elif conf.CheckStatement('std::tr1::shared_ptr<int> x', '#include <memory>'):
+    configh['CT_USE_MSFT_SHARED_PTR'] = 1
+elif conf.CheckStatement('boost::shared_ptr<int> x', '#include <boost/shared_ptr.hpp>'):
+    configh['CT_USE_BOOST_SHARED_PTR'] = 1
+else:
+    config_error("Couldn't find a working shared_ptr implementation.")
+
 import SCons.Conftest, SCons.SConf
 ret = SCons.Conftest.CheckLib(SCons.SConf.CheckContext(conf),
                               ['sundials_cvodes'],
@@ -1192,7 +1210,7 @@ else:
 # *** Set options needed in config.h ***
 # **************************************
 
-configh = {'CANTERA_VERSION': quoted(env['cantera_version'])}
+configh['CANTERA_VERSION'] = quoted(env['cantera_version'])
 
 # Conditional defines
 def cdefine(definevar, configvar, comp=True, value=1):

include/cantera/base/config.h.in

@@ -55,6 +55,12 @@ typedef  int          ftnlen;       // Fortran hidden string length type
 %(LAPACK_NAMES_LOWERCASE)s
 %(LAPACK_FTN_TRAILING_UNDERSCORE)s
 
+//--------- shared_ptr implementation ---------
+%(CT_USE_STD_SHARED_PTR)s
+%(CT_USE_TR1_SHARED_PTR)s
+%(CT_USE_MSFT_SHARED_PTR)s
+%(CT_USE_BOOST_SHARED_PTR)s
+
 //-------- BOOST --------
 %(USE_BOOST_MATH)s
 

include/cantera/base/smart_ptr.h

@@ -0,0 +1,33 @@
+#include "config.h"
+
+#if defined CT_USE_STD_SHARED_PTR
+#include <memory>
+namespace Cantera
+{
+    using std::shared_ptr;
+}
+
+#elif defined CT_USE_TR1_SHARED_PTR
+#include <tr1/memory>
+namespace Cantera
+{
+    using std::tr1::shared_ptr;
+}
+
+#elif defined CT_USE_MSFT_SHARED_PTR
+#include <memory>
+namespace Cantera
+{
+    using std::tr1::shared_ptr;
+}
+
+#elif defined CT_USE_BOOST_SHARED_PTR
+#include <boost/shared_ptr.hpp>
+namespace Cantera
+{
+    using boost::shared_ptr;
+}
+
+#else
+#error "No shared_ptr implementation available"
+#endif