Fixed layer constructors to support VS2015

dlib/cmake

@@ -78,8 +78,6 @@ elseif (MSVC OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") # else if using Visu
         message(STATUS "Enabling SSE2 instructions")
         add_definitions(-DDLIB_HAVE_SSE2)
     endif()
-	# DNN module produces long type names for NN definitions - disable this warning for MSVC
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4503")
 endif()
 
 

dlib/dnn/core.h

@@ -1365,7 +1365,7 @@ namespace dlib
         static_assert(sample_expansion_factor >= 1,
             "The input layer can't produce fewer output tensors than there are inputs.");
 
-        add_tag_layer() = default;
+        add_tag_layer() {};
         add_tag_layer(const add_tag_layer&) = default;
         add_tag_layer(add_tag_layer&&) = default;
         add_tag_layer& operator=(add_tag_layer&&) = default;
@@ -2554,7 +2554,7 @@ namespace dlib
         static_assert(sample_expansion_factor >= 1,
             "The input layer can't produce fewer output tensors than there are inputs.");
 
-        add_skip_layer() = default;
+        add_skip_layer() {};
         add_skip_layer(const add_skip_layer&) = default;
         add_skip_layer(add_skip_layer&&) = default;
         add_skip_layer& operator=(add_skip_layer&&) = default;