Tpetra::ScopeGuard Class Reference

Scope guard whose destructor automatically calls Tpetra::finalize for you. More...

#include <Tpetra_Core.hpp>

Public Member Functions
	ScopeGuard (int *argc, char ***argv)
	Initialize Tpetra. More...
	ScopeGuard ()=delete
	Default constructor (FORBIDDEN) More...
	~ScopeGuard ()
	Finalize Tpetra. More...

Detailed Description

Scope guard whose destructor automatically calls Tpetra::finalize for you.

This class' constructor does the same thing as Tpetra::initialize (see above). Its destructor automatically calls Tpetra::finalize. This ensures correct Tpetra finalization even if intervening code throws an exception.

Compare to Kokkos::ScopeGuard and Teuchos::GlobalMPISession.

Always give the ScopeGuard instance a name. Otherwise, you'll create a temporary object whose destructor will be called right away. That's not what you want.

Here is an example of how to use this class:

#include "Tpetra_Core.hpp"
#include "Tpetra_Map.hpp"

int main (int argc, char* argv[]) {
  Tpetra::ScopeGuard tpetraScope (&argc, &argv);

  // Never create Tpetra or Kokkos objects (other than
  // the ScopeGuard object itself) at main scope.
  // Otherwise, their destructors will be called after
  // MPI_Finalize and Kokkos::finalize are called, which
  // is forbidden.
  {
    auto comm = Tpetra::getDefaultComm ();
    using GO = Tpetra::Map<>::global_ordinal_type;
    const GO gblNumInds = 1000;
    const GO indexBase = 0;
    Tpetra::Map<> map (gblNumInds, indexBase, comm,
                       Tpetra::GloballyDistributed);
    // ... code that uses map ...
  }
  return EXIT_SUCCESS;
}

Definition at line 189 of file Tpetra_Core.hpp.

Constructor & Destructor Documentation

Tpetra::ScopeGuard::ScopeGuard	(	int *	argc,
		char ***	argv
	)

Initialize Tpetra.

If MPI_Init has not yet been called, then call it. If Kokkos::initialize has not yet been called, then call it.

Parameters

argc	[in/out] Address of the first argument to main().
argv	[in/out] Address of the second argument to main().

Definition at line 344 of file Tpetra_Core.cpp.

Tpetra::ScopeGuard::ScopeGuard ( )

delete

Default constructor (FORBIDDEN)

You must give ScopeGuard's constructor argc and argv. Use the constructor above this one.

Tpetra::ScopeGuard::~ScopeGuard

(

)

Finalize Tpetra.

If the constructor called Kokkos::initialize, then call Kokkos::finalize. If the constructor called MPI_Init, then call MPI_Finalize.

Definition at line 356 of file Tpetra_Core.cpp.

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The documentation for this class was generated from the following files:

• Tpetra_Core.hpp
• Tpetra_Core.cpp