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[Anders Logg <logg@xxxxxxxxx>]

Take a look at demo/pde/tensor-weighted-poisson/python that demonstrates
the use of this.

In some cases, one needs the dolfin:: prefix (like MeshFunction and Array) but not in other places (like Expression and Data).
It would be good if it could be avoided completely (the prefix).

-- 
cpparg not working in new Expression class
https://bugs.launchpad.net/bugs/497395
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Status in DOLFIN: Confirmed

Bug description:
JIT compilation with cpparg=code is not working since Array is not known:

dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx: In function ‘PyObject* _wrap_Convection_eval(PyObject*, PyObject*)’:
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2721: error: ‘Array’ was not declared in this scope
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2721: error: expected primary-expression before ‘double’
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2721: error: expected ‘;’ before ‘double’
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2758: error: ‘arg2’ was not declared in this scope
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2758: error: expected type-specifier before ‘Array’
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2758: error: expected ‘>’ before ‘Array’
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2758: error: expected ‘(’ before ‘Array’
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2758: error: expected primary-expression before ‘double’
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2758: error: expected ‘)’ before ‘double’
dolfin_compile_code_63e61793c4d05809102d0089ac836490_wrap.cxx:2758: error: expected ‘;’ before ‘double’
error: command 'gcc' failed with exit status 1