The GNU Fortran Compiler: MALLOC

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### 8.184 `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`.

Standard:

  GNU extension

Class:

  Function

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

See also:

  FREE