50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
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// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
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// expected-no-diagnostics
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namespace ParameterPacksWithFunctions {
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template<typename ...> struct count;
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template<typename Head, typename ...Tail>
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struct count<Head, Tail...> {
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static const unsigned value = 1 + count<Tail...>::value;
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};
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template<>
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struct count<> {
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static const unsigned value = 0;
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};
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template<unsigned> struct unsigned_c { };
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template<typename ... Types>
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unsigned_c<count<Types...>::value> f();
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void test_f() {
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unsigned_c<0> uc0a = f(); // okay, deduced to an empty pack
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unsigned_c<0> uc0b = f<>();
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unsigned_c<1> uc1 = f<int>();
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unsigned_c<2> uc2 = f<float, double>();
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}
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}
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namespace rdar12176336 {
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typedef void (*vararg_func)(...);
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struct method {
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vararg_func implementation;
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method(vararg_func implementation) : implementation(implementation) {}
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template<typename TReturnType, typename... TArguments, typename TFunctionType = TReturnType (*)(TArguments...)>
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auto getImplementation() const -> TFunctionType
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{
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return reinterpret_cast<TFunctionType>(implementation);
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}
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};
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void f() {
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method m(nullptr);
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auto imp = m.getImplementation<int, int, int>();
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}
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}
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