Add a function for detecting whether amrex::Initialize has been called or not. (#2501)

Author: atmyers

Src/Base/AMReX.H

@@ -76,6 +76,13 @@ namespace amrex
                        std::ostream& a_oserr = std::cerr,
                        ErrorHandler a_errorhandler = nullptr);
 
+    /**
+       \brief Returns true if there are any currently-active and initialized
+       AMReX instances (i.e. one for which amrex::Initialize has been called,
+       and amrex::Finalize has not). Otherwise false.
+     */
+    bool Initialized ();
+
     void Finalize (AMReX* pamrex);
     void Finalize (); // Finalize the current top
     /**

Src/Base/AMReX.cpp

@@ -575,6 +575,12 @@ amrex::Initialize (int& argc, char**& argv, bool build_parm_parse,
     return AMReX::top();
 }
 
+bool
+amrex::Initialized ()
+{
+    return !amrex::AMReX::empty();
+}
+
 void
 amrex::Finalize ()
 {