Have a gmock method, and during test, need to set the out parameter to variable address. So that the out parameter of dequeue, which is data points to variable ch;

MOCK_METHOD1(dequeue, void(void* data));

char ch = 'm';
void* a = (void*)&ch;

EXPECT_CALL(FQO, dequeue(_))
        .WillOnce(/*here I need to set argument to a*/);

I tried to figure out side effects: https://code.google.com/p/googlemock/wiki/V1_7_CheatSheet#Side_Effects but keep getting an error.