Add a default ctor to MatBSR<FPP, GPU2> and implement set_gpu_mat_ptr.

Update to gpu_mod@3d0a4dc6

gpu_mod @ 3d0a4dc6

-Subproject commit d7cb67c8f8aa5429153b744d7d4eb2cb47a704aa
+Subproject commit 3d0a4dc64dc7158e4cf95f6b85d3829e5fc3a678

src/faust_linear_operator/GPU2/faust_MatBSR_gpu.cpp.in

@@ -12,7 +12,7 @@ namespace Faust
 				const int32_t* browptr,
 				const int32_t* bcolinds,
 				const int32_t dev_id/*=-1*/,
-				const void* stream/*=nullptr*/)
+				const void* stream/*=nullptr*/) : MatBSR<@FAUST_SCALAR_FOR_GM@, GPU2>()
 		{
 			auto bsr_funcs = GPUModHandler::get_singleton()->bsr_funcs((@FAUST_SCALAR_FOR_GM@)(0));
 			auto gp_funcs = GPUModHandler::get_singleton()->gp_funcs();

src/faust_linear_operator/GPU2/faust_MatBSR_gpu.h

@@ -43,6 +43,8 @@ namespace Faust
 					const int32_t dev_id=-1,
 					const void* stream=nullptr);
 
+			MatBSR();
+
 			/*********** MatGeneric member functions **************/
 			void setZeros();
 			size_t getNBytes() const;

src/faust_linear_operator/GPU2/faust_MatBSR_gpu.hpp

@@ -19,6 +19,11 @@ namespace Faust
 
 	}
 
+	template<typename FPP>
+		MatBSR<FPP, GPU2>::MatBSR() : gpu_mat(nullptr)
+		{
+		}
+
 	template<typename FPP>
 		void MatBSR<FPP, GPU2>::setZeros()
 		{
@@ -129,8 +134,8 @@ namespace Faust
 		}
 
 	template<typename FPP>
-		void MatBSR<FPP, GPU2>::set_gpu_mat_ptr(void*)
+		void MatBSR<FPP, GPU2>::set_gpu_mat_ptr(void* gpu_mat)
 		{
-			//TODO: implement (maybe by moving into .cpp.in
+			this->gpu_mat = gpu_mat;
 		}
 };