add template for dtype transfer (#47)

Author: yujiaoliang

excuter/cpp-common/src/deepx/dtype.hpp

@@ -475,5 +475,43 @@ namespace deepx
         }
     }
 
+    template <Precision P>
+    struct PrecisionWrapper {};
+
+    template <typename PrecisionWrapper>
+    struct to_tensor_type;
+
+    template <>
+    struct to_tensor_type<PrecisionWrapper<Precision::Float64>> {
+        using type = double;
+    };
+
+    template <>
+    struct to_tensor_type<PrecisionWrapper<Precision::Float32>> {
+        using type = float;
+    };
+
+    template <>
+    struct to_tensor_type<PrecisionWrapper<Precision::Int64>> {
+        using type = int64_t;
+    };
+
+    template <>
+    struct to_tensor_type<PrecisionWrapper<Precision::Int32>> {
+        using type = int32_t;
+    };
+    
+    template <>
+    struct to_tensor_type<PrecisionWrapper<Precision::Int16>> {
+        using type = int16_t;
+    };
+
+    template <>
+    struct to_tensor_type<PrecisionWrapper<Precision::Int8>> {
+        using type = int8_t;
+    };
+
+    template <Precision p>
+    using tensor_t = typename to_tensor_type<PrecisionWrapper<p>>::type; 
 } // namespace deepx
 #endif

excuter/cpp-common/test/0_dtypes.cpp

@@ -6,9 +6,7 @@ using namespace std;
 using namespace deepx::tf;
 using namespace deepx;
 
-int main(int argc, char **argv)
-{
-
+void test_1() {
     unordered_map<string, TypeDef> dtype_map = {
         {"tensor<any>", make_dtype(DataCategory::Tensor, Precision::Any)},
         {"tensor<int>", make_dtype(DataCategory::Tensor, Precision::Int)},
@@ -54,6 +52,26 @@ int main(int argc, char **argv)
     }
 
     cout << string(80, '=') << endl;
+}
+
+// test to tensor type
+void test_2() {
+    if (typeid(tensor_t<Precision::Float64>)== typeid(double)) {
+        std::cout<<"it's ok"<<std::endl;
+    } else {
+        std::cout<<"it's wrong"<<std::endl;
+    }
 
+    if (typeid(tensor_t<Precision::Float32>)== typeid(float)) {
+        std::cout<<"it's ok"<<std::endl;
+    } else {
+        std::cout<<"it's wrong"<<std::endl;
+    }
+}
+
+int main(int argc, char **argv)
+{
+    // test_1();
+    test_2();
     return 0;
 }