circuitpython/examples/usercmodule/cppexample/example.cpp
stijn 25c4563f26 examples: Add example code for user C modules, both C and C++.
Add working example code to provide a starting point for users with files
that they can just copy, and include the modules in the coverage test to
verify the complete user C module build functionality.  The cexample module
uses the code originally found in cmodules.rst, which has been updated to
reflect this and partially rewritten with more complete information.
2020-10-29 15:30:42 +11:00

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C++

extern "C" {
#include <examplemodule.h>
// Here we implement the function using C++ code, but since it's
// declaration has to be compatible with C everything goes in extern "C" scope.
mp_obj_t cppfunc(mp_obj_t a_obj, mp_obj_t b_obj) {
// Prove we have (at least) C++11 features.
const auto a = mp_obj_get_int(a_obj);
const auto b = mp_obj_get_int(b_obj);
const auto sum = [&]() {
return mp_obj_new_int(a + b);
} ();
// Prove we're being scanned for QSTRs.
mp_obj_t tup[] = {sum, MP_ROM_QSTR(MP_QSTR_hellocpp)};
return mp_obj_new_tuple(2, tup);
}
}