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parser(C++11) : explicit template function support, see https://github.com/swig/swig/issues/2131

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This commit is contained in:
romin.tomasetti 2022-01-22 15:05:23 +00:00
commit 8be363eae3
3 changed files with 50 additions and 3 deletions
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25
Examples/test-suite/cpp11_template_explicit.i
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@ -4,6 +4,7 @@
*/
%module cpp11_template_explicit
/* Explicitely silence SWIG warning related to explicit templates */
#pragma SWIG nowarn=SWIGWARN_PARSE_EXPLICIT_TEMPLATE
%inline %{
@ -33,6 +34,30 @@ extern template class Temper<B*>;
template class Temper<int>;
extern template class Temper<short>;
/* Templated function to check support for extern template functions */
template <typename T>
T my_templated_function(int a, double b)
{
return T();
}
/* Explicit extern function template instantiation with simple type */
extern template int my_templated_function<int>(int, double);
template int my_templated_function<int>(int, double);
/* Explicit extern function template instantiation with more complex types */
extern template A my_templated_function<A>(int, double);
template A my_templated_function<A>(int, double);
extern template Temper<int> my_templated_function<Temper<int>>(int, double);
template Temper<int> my_templated_function<Temper<int>>(int, double);
%}
%template(TemperInt) Temper<int>;
/* Enable several versions of the templated function */
%template(my_templated_function_int ) my_templated_function<int>;
%template(my_templated_function_A ) my_templated_function<A>;
%template(my_templated_function_TemperInt) my_templated_function<Temper<int>>;

11
Examples/test-suite/python/cpp11_template_explicit_runme.py Normal file
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@ -0,0 +1,11 @@
import cpp11_template_explicit
# Call variants of the same templated function
t1 = cpp11_template_explicit.my_templated_function_int (1,1.0)
t2 = cpp11_template_explicit.my_templated_function_A (2,2.0)
t3 = cpp11_template_explicit.my_templated_function_TemperInt(3,3.0)
# Check return types
assert isinstance(t1,int)
assert isinstance(t2,cpp11_template_explicit.A)
assert isinstance(t3,cpp11_template_explicit.TemperInt)

17
Source/CParse/parser.y
View file

@ -4361,12 +4361,23 @@ cpp_template_decl : TEMPLATE LESSTHAN template_parms GREATERTHAN {
$$ = 0;
}
/* Explicit template instantiation without the translation unit */
/* Explicit function template instantiation */
| TEMPLATE cpp_alternate_rettype idcolon LPAREN parms RPAREN {
Swig_warning(WARN_PARSE_EXPLICIT_TEMPLATE, cparse_file, cparse_line, "Explicit function template instantiation ignored.\n");
$$ = 0;
}
/* Explicit class template instantiation without the translation unit */
| EXTERN TEMPLATE cpptype idcolon {
Swig_warning(WARN_PARSE_EXPLICIT_TEMPLATE, cparse_file, cparse_line, "Explicit template instantiation ignored.\n");
Swig_warning(WARN_PARSE_EXPLICIT_TEMPLATE, cparse_file, cparse_line, "Explicit (extern) class template instantiation ignored.\n");
$$ = 0;
}
;
/* Explicit function template instantiation without the translation unit */
| EXTERN TEMPLATE cpp_alternate_rettype idcolon LPAREN parms RPAREN {
Swig_warning(WARN_PARSE_EXPLICIT_TEMPLATE, cparse_file, cparse_line, "Explicit (extern) function template instantiation ignored.\n");
$$ = 0;
}
;
cpp_template_possible: c_decl {
$$ = $1;