$var

The Xc++ language allows for reflecting global variables using $var.

For example

$var+ string8 s;

The + means that the global variable is public - so it is reflected and if it's defined in a library then it is exported by the library. For a windows dll __declspec(dllexport) or __declspec(dllimport) are applied as required to both declarations and definitions of exported global variables.

When a $var is reflected an instance of a ReflectedGlobalVariable is registered in the ReflectedGlobalVariable registry.

Definition of a global variable

The following is a definition of a reflected global variable:

namespace ns
{
    $var+ int32 x = 10;
}

A global variable must be defined only once. Therefore definitions of global variables appear in cpp files not header files.

Declaration of a global variable

Declarations of global variables in header files are qualified with extern. For example:

namespace ns
{
    $var+ extern int32 x;
}