Google Mock : Setting argument in EXPECT_CALL - c++

Question

I am trying to set a class member function parameter value in Google Mock, but I get build errors and I simply don't understand what is going on. Would it be possible for someone to explain please.
The function prototype is:
virtual int recv( Socket socket
, char *buffer
, int bufferLength
, int flags ) = 0;
I am trying to test it using:
TEST_F( IPV4SocketTests, Read_SockErr_ok )
{
Mock_SocketAdaptor *adaptor = new Mock_SocketAdaptor;
char *rcvBuffer = "testingRcvWorks";
EXPECT_CALL( *adaptor, recv( testing::_, testing::_, testing::_, testing::_ ) )
.WillRepeatedly( testing::DoAll(
testing::SetArgPointee<1>( rcvBuffer ),
testing::Return( strlen( rcvBuffer ) ) ) );
The error I am getting is regarding conversion from std::get.

Answer 1

The problem is that rcvBuffer is a pointer. That is why you must dereference it when setting the pointee. Here is how your EXPECT_CALL should look:
EXPECT_CALL( *adaptor, recv( testing::_, testing::_, testing::_, testing::_ ) )
.WillRepeatedly( testing::DoAll(
testing::SetArgPointee<1>( *rcvBuffer ),
testing::Return( strlen( rcvBuffer ) ) ) );
EDIT:
This is the approach I've used in my projects to mock returning a char array through a pointer
used as argument. First, you need to create a custom action that will copy the contents of the
buffer (you cannot use SetArrayArgument in this case):
ACTION_TEMPLATE(SetArgNPointeeTo, HAS_1_TEMPLATE_PARAMS(unsigned, uIndex), AND_2_VALUE_PARAMS(pData, uiDataSize))
{
std::memcpy(std::get<uIndex>(args), pData, uiDataSize);
}
Then, in a test use it like this:
Mock_SocketAdaptor *adaptor = new Mock_SocketAdaptor;
char rcvBuffer[] = "testingRcvWorks";
size_t bufferSize = sizeof("testingRcvWorks");
EXPECT_CALL( *adaptor, recv( testing::_, testing::_, testing::_, testing::_ ) )
.WillRepeatedly( testing::DoAll(
SetArgNPointeeTo<0>(std::begin(rcvBuffer), bufferSize),
testing::Return( strlen( rcvBuffer ) ) ) );