012. Fortran has allocation-on-assignment

topic: Allocation

Fortran has allocation on assignment, but you cannot use the allocate statement for an array that is already allocated.

alloc-on-assign.f90 | | |

integer, allocatable :: v(:)

v = [4, 9]

deallocate(v)  ! necessary for line below to work
allocate(v, source=[4, 9])  ! same result as above

end

Output1

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Fortran has allocation on assignment, but you cannot use the ALLOCATE statement for an array that is allocated

integer, allocatable :: v(:)
v = [4,9]
deallocate(v) ! necessary for line below to work
allocate (v,source=[4,9]) ! same as above

— FortranTip (@fortrantip) December 18, 2021

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Compiled using GNU Fortran (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 with no flags