Dear All, I am trying to compile the following code: #include <ginac/ginac.h> using namespace GiNaC; using namespace std; int main () { symbol x("x"); ex a=exp(x); cout << is_a<symbol>(x) << endl; cout << is_a<function>(a) << endl; } If a compiler option -std=gnu++11 is used, I got errors like this: test-g.cpp:9:26: error: no matching function for call to 'is_a(GiNaC::ex&)' cout << is_a<function>(a) << endl; (see the full log at the end of my message). Compiler complains about is_a<symbol> but is happy with is_a<function>(a). The code can be compiled and run well if -std=gnu++11 is omitted. Any suggestions? Best wishes, Vladimir -- Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://goo.gl/EaG2Vu Software: Geometry of cycles http://moebinv.sourceforge.net/ ===================================================================== test-g.cpp: In function 'int main()': test-g.cpp:9:10: error: parse error in template argument list cout << is_a<function>(a) << endl; ^ test-g.cpp:9:26: error: no matching function for call to 'is_a(GiNaC::ex&)' cout << is_a<function>(a) << endl; ^ In file included from /usr/include/ginac/registrar.h:27:0, from /usr/include/ginac/basic.h:29, from /usr/include/ginac/ginac.h:28, from test-g.cpp:1: /usr/include/ginac/print.h:181:13: note: candidate: template<class T> bool GiNaC::is_a(const GiNaC::print_context&) inline bool is_a(const print_context & obj) ^ /usr/include/ginac/print.h:181:13: note: template argument deduction/substitution failed: test-g.cpp:9:26: error: template argument 1 is invalid cout << is_a<function>(a) << endl; ^ In file included from /usr/include/ginac/ginac.h:28:0, from test-g.cpp:1: /usr/include/ginac/basic.h:311:13: note: candidate: template<class T> bool GiNaC::is_a(const GiNaC::basic&) inline bool is_a(const basic &obj) ^ /usr/include/ginac/basic.h:311:13: note: template argument deduction/substitution failed: test-g.cpp:9:26: error: template argument 1 is invalid cout << is_a<function>(a) << endl; ^ In file included from /usr/include/ginac/ginac.h:30:0, from test-g.cpp:1: /usr/include/ginac/ex.h:930:13: note: candidate: template<class T> bool GiNaC::is_a(const GiNaC::ex&) inline bool is_a(const ex &obj) ^ /usr/include/ginac/ex.h:930:13: note: template argument deduction/substitution failed: test-g.cpp:9:26: error: template argument 1 is invalid cout << is_a<function>(a) << endl; ^