COMP: force c++14 standard

- update CMake minimum required version
- set the C++ standard
- set otb::Image constructor to =delete to test

CMakeLists.txt

@@ -18,7 +18,7 @@
 # limitations under the License.
 #
 
-cmake_minimum_required(VERSION 2.8.11)
+cmake_minimum_required(VERSION 3.1.0)
 
 foreach(p
     CMP0025 # CMake 3.0
@@ -43,6 +43,10 @@ endif()
 
 project(OTB)
 
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
 include(CMakeDependentOption)
 #
 # use ExternalProject

Modules/Core/ImageBase/include/otbImage.h

@@ -197,10 +197,10 @@ protected:
   ~Image() ITK_OVERRIDE {}
 
 private:
-  Image(const Self &); //purposely not implemented
+  Image(const Self &) = delete;
   void operator =(const Self&); //purposely not implemented
 
-  /** Return the ImageMetadataInterfacePointer associated to the data
+    /** Return the ImageMetadataInterfacePointer associated to the data
    *  and creates it on first call
    */
   ImageMetadataInterfacePointerType GetMetaDataInterface() const;