[c++2py] TRIQS/unstable - NB5 ''max() arg is an empty sequence'' #7
Description
Using TRIQS/unstable, the following triqs magic copied out of 5-Parameters.ipynb
%%triqs --only g
#include <vector>
#include <string>
struct params{
int i;
double x=0;
double z=3;
std::string s = "what ?";
std::vector<int> v;
};
/// g
CPP2PY_ARG_AS_DICT
double g(params const & a) {
std::cout << "s = " << a.s << std::endl;
return a.i + a.x + a.v.at(0);
}fails with
----------------------------c++2py error ----------------------------
Welcome to the wrapper desc file generator of TRIQS, based on libclang !
Parsing the C++ file (may take a few seconds) ...
... done.
Extracting ...
Analysing params
... done
Parsing C++ code. Generating the wrapper and converters ...
Transforming no argument accessors into Python properties
Generating the converters for parameters classes : params
Traceback (most recent call last):
File "/home/nwentzel/opt/triqs/bin/c++2py.py", line 159, in <module>
rendered = tpl.render(classes = classes_of_parameters, args = args, shell_command= shell_command )
File "/usr/lib/python2.7/site-packages/mako/template.py", line 462, in render
return runtime._render(self, self.callable_, args, data)
File "/usr/lib/python2.7/site-packages/mako/runtime.py", line 838, in _render
**_kwargs_for_callable(callable_, data))
File "/usr/lib/python2.7/site-packages/mako/runtime.py", line 873, in _render_context
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
File "/usr/lib/python2.7/site-packages/mako/runtime.py", line 899, in _exec_template
callable_(context, *args, **kwargs)
File "_home_nwentzel_opt_triqs_share_triqs_cpp2py_mako_parameters_rst", line 59, in render_body
File "_home_nwentzel_opt_triqs_share_triqs_cpp2py_mako_parameters_rst", line 43, in doc_format
ValueError: max() arg is an empty sequence
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
<ipython-input-3-bc9d327f0455> in <module>()
----> 1 get_ipython().run_cell_magic(u'triqs', u'--only g', u'#include <vector>\n#include <string>\n\nstruct params{ \n int i;\n double x=0; \n double z=3;\n std::string s = "what ?"; \n std::vector<int> v;\n};\n\n/// g\nCPP2PY_ARG_AS_DICT\ndouble g(params const & a) {\n std::cout << "s = " << a.s << std::endl; \n return a.i + a.x + a.v.at(0); \n}')
/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.pyc in run_cell_magic(self, magic_name, line, cell)
2113 magic_arg_s = self.var_expand(line, stack_depth)
2114 with self.builtin_trap:
-> 2115 result = fn(magic_arg_s, cell)
2116 return result
2117
<decorator-gen-122> in triqs(self, line, cell)
/usr/lib/python2.7/site-packages/IPython/core/magic.pyc in <lambda>(f, *a, **k)
186 # but it's overkill for just that one bit of state.
187 def magic_deco(arg):
--> 188 call = lambda f, *a, **k: f(*a, **k)
189
190 if callable(arg):
/home/nwentzel/opt/triqs/lib/python2.7/site-packages/pytriqs/magic.pyc in triqs(self, line, cell)
144 only_list = ','.join(args.only)
145 only_list = (" --only " + only_list) if only_list else ''
--> 146 execute(cpp2py_bin + " ./ext.cpp -p -m ext -o ext" + only_list, "c++2py")
147
148 # Call the wrapper generator
/home/nwentzel/opt/triqs/lib/python2.7/site-packages/pytriqs/magic.pyc in execute(command, message)
137 except subprocess.CalledProcessError as E :
138 print_out ( message + " error ", E.output)
--> 139 raise RuntimeError, "Error"
140 if args.verbosity>0:
141 print_out(message, out)
RuntimeError: Error