MALLOC — Allocate dynamic memory

Description

MALLOC(SIZE) allocates SIZE bytes of dynamic memory and returns the address of the allocated memory. The MALLOC intrinsic is an extension intended to be used with Cray pointers, and is provided in GNU Fortran to allow the user to compile legacy code. For new code using Fortran 95 pointers, the memory allocation intrinsic is ALLOCATE.

Syntax

PTR = MALLOC(SIZE)

Arguments

SIZE The type shall be INTEGER.

Return value

The return value is of type INTEGER(K), with K such that variables of type INTEGER(K) have the same size as C pointers (sizeof(void *)).

Example

The following example demonstrates the use of MALLOC and FREE with Cray pointers.



program test_malloc

  implicit none

  integer i

  real*8 x(*), z

  pointer(ptr_x,x)



  ptr_x = malloc(20*8)

  do i = 1, 20

    x(i) = sqrt(1.0d0 / i)

  end do

  z = 0

  do i = 1, 20

    z = z + x(i)

    print *, z

  end do

  call free(ptr_x)

end program test_malloc

Standard

GNU extension

Class

Function