STYLE: Remove std::allocator from TestImportImageContainer (Common/test)

Replaced the use of `std::allocator` by the equivalent `new Element[]` and
`delete[]` statements. Renamed `m_MemoryAllocatedByAllocator` to
`m_MemoryAllocatedByTestImportImageContainer`.

Aims to simplify the code, and make it easier to upgrade to C++17 and further.
C++17 has deprecated the `std::allocator::allocate` and
`std::allocator::destroy` function calls that are removed with this commit.

Author: N-Dekker

Modules/Core/Common/test/itkFactoryTestLib.cxx

@@ -43,8 +43,6 @@ class TestImportImageContainer : public itk::ImportImageContainer<TElementIdenti
   using typename Superclass::ElementIdentifier;
   using typename Superclass::Element;
 
-  using Allocator = std::allocator<TElement>;
-
   // Methods from itkObject
   virtual ~TestImportImageContainer()
   {
@@ -67,21 +65,9 @@ class TestImportImageContainer : public itk::ImportImageContainer<TElementIdenti
     TElement * data;
     try
     {
-      // allocate normally only requires 1 argument.
-      // MSVC 6.0 makes it require 2, we set the second to be
-      // a null pointer which means no allocation hint
-      // Sun cc compiler needs a cast to assign a void pointer to another pointer
-      data = static_cast<TElement *>(m_Allocator.allocate(size, 0));
-      if (data)
-      {
-        new (data) Element[size];
-      }
+      data = new Element[size];
     }
     catch (...)
-    {
-      data = 0;
-    }
-    if (!data)
     {
       // We cannot construct an error string here because we may be out
       // of memory.  Do not use the exception macro.
@@ -91,7 +77,7 @@ class TestImportImageContainer : public itk::ImportImageContainer<TElementIdenti
     m_TotalSize = size * sizeof(TElement);
     itkTotalMemoryUsed += m_TotalSize;
 
-    m_MemoryAllocatedByAllocator = true;
+    m_MemoryAllocatedByTestImportImageContainer = true;
 
     std::cout << "TestImportImageContainer: Total memory used is " << itkTotalMemoryUsed << " bytes" << std::endl;
 
@@ -105,16 +91,9 @@ class TestImportImageContainer : public itk::ImportImageContainer<TElementIdenti
               << typeid(TElement).name() << " totaling " << sizeof(TElement) * this->Capacity() << " bytes"
               << std::endl;
 
-    if (m_MemoryAllocatedByAllocator)
+    if (m_MemoryAllocatedByTestImportImageContainer)
     {
-      TElement *             ptr = this->GetImportPointer();
-      const TElement * const end = ptr + this->Capacity();
-      for (TElement * base = ptr; base < end; ++base)
-      {
-        m_Allocator.destroy(base);
-      }
-      m_Allocator.deallocate(ptr, this->Capacity());
-
+      delete[] this->GetImportPointer();
       this->SetImportPointer(0);
       this->SetCapacity(0);
       this->SetSize(0);
@@ -130,8 +109,7 @@ class TestImportImageContainer : public itk::ImportImageContainer<TElementIdenti
 private:
   mutable TElementIdentifier m_TotalSize;
 
-  mutable Allocator m_Allocator;
-  mutable bool      m_MemoryAllocatedByAllocator{ false };
+  mutable bool m_MemoryAllocatedByTestImportImageContainer{ false };
 };
 
 class ImportImageContainerFactory : public itk::ObjectFactoryBase