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Instantiation of C++11 variadic function templates

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Complete support for C++11 variadic function templates. Support was previously limited
to just one template parameter. Now zero or more template parameters are supported
in the %template instantiation.
This commit is contained in:
William S Fulton 2023-01-03 22:34:59 +00:00
commit 2fc0edc4fd
5 changed files with 132 additions and 55 deletions
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18
Examples/test-suite/cpp11_variadic_function_templates.i
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@ -78,5 +78,19 @@ void emplace(Args &&... args) noexcept(
%}
%template(emplace) EmplaceContainer::emplace<int,A>;
// TODO
//%template(emplace) EmplaceContainer::emplace<int,A,B,C>;
%template(emplace) EmplaceContainer::emplace<int,A,B>;
%template(emplace) EmplaceContainer::emplace<int,A,B,C>;
%template(emplace) EmplaceContainer::emplace<int,A,B,C,D>;
// Overloading mix of variadic and non-variadic templates
%inline %{
template<typename T, typename U> int variadicmix1(T t, U u) { return 10; }
template<typename... T> int variadicmix1(T... t) { return 20; }
%}
%template(variadicmix1) variadicmix1<>;
%template(variadicmix1) variadicmix1<A>;
%template(variadicmix1) variadicmix1<A,B>;
%template(variadicmix1) variadicmix1<A,B,C>;
%template(variadicmix1) variadicmix1<int, int>;

20
Examples/test-suite/python/cpp11_variadic_function_templates_runme.py Normal file
View file

@ -0,0 +1,20 @@
from cpp11_variadic_function_templates import *
ec = EmplaceContainer()
ec.emplace(A())
ec.emplace(A(), B())
ec.emplace(A(), B(), C())
ec.emplace(A(), B(), C(), D())
def check(expected, got):
if expected != got:
raise RuntimeError("failed: {} != {}".format(expected, got))
a = A()
b = B()
c = C()
check(variadicmix1(), 20)
check(variadicmix1(a), 20)
check(variadicmix1(a, b), 10)
check(variadicmix1(a, b, c), 20)
check(variadicmix1(11, 22), 10)