PetscCallCXX#

Checks C++ function calls and if they throw an exception, catch it and then return a PETSc error code

Synopsis#

#include <petscerror.h>
void PetscCallCXX(...) noexcept;

Not Collective

Input Parameter#

VA_ARGS - An arbitrary expression

Notes#

PetscCallCXX(...) is a macro replacement for

  try {
    __VA_ARGS__;
  } catch (const std::exception& e) {
    return ConvertToPetscErrorCode(e);
  }

Due to the fact that it catches any (reasonable) exception, it is essentially noexcept.

If you cannot return a PetscErrorCode use PetscCallCXXAbort() instead.

Example Usage#

  void foo(void) { throw std::runtime_error("error"); }

  void bar()
  {
    PetscCallCXX(foo()); // ERROR bar() does not return PetscErrorCode
  }

  PetscErrorCode baz()
  {
    PetscCallCXX(foo()); // OK

    PetscCallCXX(
      bar();
      foo(); // OK multiple statements allowed
    );
  }

  struct bop
  {
    bop()
    {
      PetscCallCXX(foo()); // ERROR returns PetscErrorCode, cannot be used in constructors
    }
  };

  // ERROR contains do-while, cannot be used as function-try block
  PetscErrorCode qux() PetscCallCXX(
    bar();
    baz();
    foo();
    return 0;
  )