Custom action library, initial version

installer/src/installer-lib/DLL.cpp

Index: installer/src/installer-lib/DLL.cpp
===================================================================
new file mode 100644
--- /dev/null
+++ b/installer/src/installer-lib/DLL.cpp
@@ -0,0 +1,57 @@
+/**
+ * \file abp_ca.cpp Top-level source for custom actions. Includes DLL initialization.
+ */
+#include "DLL.h"
+#include <stdexcept>
+
+std::shared_ptr< DLL_Module > DLL_Module::singleton = 0 ;
+
+DLL_Module & 
+DLL_Module::module()
+{ 
+  if ( singleton )
+  {
+    return * singleton;
+  }
+  throw std::runtime_error( "DLL_Module::module() called when DLL module was not attached." );
+}
+
+/**
+ * The attachment function is the _de facto_ equivalent of initialization. Under ordinary circumstances, this should 
+ * only be called once, and called before everything else.
+ */
+void
+DLL_Module::attach( HINSTANCE handle )
+{
+  if ( singleton )
+  {
+    throw std::runtime_error( "May not call DLL_Module::attach() in an attached state." );
+  }
+  singleton = std::shared_ptr< DLL_Module >( new DLL_Module( handle ) ) ;
+}
+
+/**
+ * The detachment function is the _de facto_ equivalent of finalization. Under ordinary circumstances, this should 
+ * only be called once, and called after everything else.
+ */
+void 
+DLL_Module::detach()
+{
+  singleton.reset();
+}
+
+/**
+ * Since this class is mostly a replacement for a global variable, it's no surprising the constructor is almost trivial.
+ */
+DLL_Module::DLL_Module( HINSTANCE handle )
+  : handle( handle )
+{
+}
+
+std::wstring 
+DLL_Module::name() 
+{
+  if ( _name )
+    return *_name ;
+  throw std::runtime_error( "Not yet implemented" );
+}