That makes perfect sense---thanks.
On Mon, Aug 31, 2009 at 12:36 PM, Kenton Varda <ken...@google.com> wrote:
> The problem is that the parameter binding that you are providing has type
> DummyResponse* but the method you are trying to bind takes const
> DummyResponse*. Even though the former is implicitly convertible to the
> latter, the compiler will not consider this when selecting a template
> overload. The solution is to manually cast the pointer to make it const
> before calling NewCallback.
>
> On Sun, Aug 30, 2009 at 9:29 PM, srlindemann <srlindem...@gmail.com>wrote:
>
>>
>> I've been messing with the Service interface in C++ but have hit a few
>> bumps with the NewCallback method. Basically, the compiler (g++ 4.2.4
>> on Ubuntu) seems to be unable to match my function call to one of the
>> template overloads---it then fails when it tries to match it to the
>> void(*)() signature. Is there something here I'm missing? I'm using
>> protobuf-2.2.0.
>>
>> Source (closure_trouble.cpp):
>>
>> #include <google/protobuf/service.h>
>>
>> class DummyResponse
>> {
>> };
>>
>> class ClosureTest
>> {
>> public:
>> void MethodWithArg(const DummyResponse* response) {}
>> };
>>
>> int main(int argc, char* argv[])
>> {
>> ClosureTest ct;
>> DummyResponse dr;
>>
>> google::protobuf::Closure* closure = google::protobuf::NewCallback
>> (&ct, &ClosureTest::MethodWithArg, &dr);
>> return 0;
>> }
>>
>> Command line:
>> m...@my-laptop:~/Programming/cpp/protio/protio_main/tests$ g++ -o
>> closure_trouble closure_trouble.cpp
>> closure_trouble.cpp: In function ‘int main(int, char**)’:
>> closure_trouble.cpp:18: error: cannot convert ‘ClosureTest*’ to ‘void
>> (*)()’ for argument ‘1’ to ‘google::protobuf::Closure*
>> google::protobuf::NewCallback(void (*)())’
>>
>> Any thoughts? Thanks.
>>
>> (P.S. I tried a number of similar variations, such as a function
>> instead of a instance method, etc. Couldn't make anything work except
>> subclassing Closure.)
>>
>> >>
>>
>
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