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Status Planned for future release
Workspace C/C++ and Fortran Compilers
Categories Fortran
Created by Guest
Created on Jul 18, 2019

RELATED IDEAS

XLF: Support for Fortran 2008 feature move_alloc

The feature is described in section "5.3 Allocatable components of recursive type" from the Fortran 2008 summary document available at https://wg5-fortran.org/N1801-N1850/N1828.pdf and appended here:

A recursive type is permitted to be based on allocatable components. Here is a simple example
of a type that holds a stack

type entry
real :: value
integer :: index
type(entry), allocatable :: next
end type entry

Here is how to add a new entry at the top of the stack:

type (entry), allocatable :: top
top = entry ( new_value, new_index, top )

Alternative code is as follows:

type (entry), allocatable :: top, temp
temp = entry ( new_value, new_index, temp )
call move_alloc(top,temp%next)
call move_alloc(temp,top)

which avoids the possiblity of a deep copy being made into a temporary variable followed by
another deep copy from it. It is reasonable to expect the compiler, when presented with the
first version to perform the equivalent of the second, but it cannot be guaranteed. Similar
considerations apply to the removal of the top entry by the code

top = top%entry

or

call move_alloc(top%next,temp)
call move_alloc(temp,top)

The usual efficiencies associated with allocatables are available: contiguous arrays, no aliasing
(unless given the target attribute), and no memory leaks.

Idea priority High
  • Guest
    Reply
    |     Aug 23, 2019

    This RFE has been implemented.

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