91 lines
2.6 KiB
Fortran
91 lines
2.6 KiB
Fortran
! Copyright 2003 Free Software Foundation, Inc.
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! Contributed by Kejia Zhao <kejia_zh@yahoo.com.cn>
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!
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!This file is part of the GNU Fortran 95 runtime library (libgfor).
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!
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!GNU libgfor is free software; you can redistribute it and/or
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!modify it under the terms of the GNU Lesser General Public
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!License as published by the Free Software Foundation; either
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!version 2.1 of the License, or (at your option) any later version.
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!
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!GNU libgfor is distributed in the hope that it will be useful,
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!but WITHOUT ANY WARRANTY; without even the implied warranty of
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!MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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!GNU Lesser General Public License for more details.
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!
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!You should have received a copy of the GNU Lesser General Public
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!License along with libgfor; see the file COPYING. If not,
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!write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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!Boston, MA 02111-1307, USA.
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!
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function selected_int_kind (r)
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implicit none
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integer, intent (in) :: r
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integer :: selected_int_kind
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integer :: i
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! Integer kind_range table
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integer, parameter :: c = 4
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type :: int_info
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integer :: kind
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integer :: range
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end type int_info
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type (int_info), parameter :: int_infos (c) = &
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(/int_info (1, range (0_1)), &
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int_info (2, range (0_2)), &
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int_info (4, range (0_4)), &
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int_info (8, range (0_8))/)
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do i = 1, c
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if (r <= int_infos (i) % range) then
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selected_int_kind = int_infos (i) % kind
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return
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end if
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end do
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selected_int_kind = -1
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return
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end function
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function selected_real_kind (p, r)
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implicit none
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integer, optional, intent (in) :: p, r
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integer :: selected_real_kind
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integer :: i, p2, r2
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logical :: found_p, found_r
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! Real kind_precision_range table
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integer, parameter :: c = 2
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type :: real_info
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integer :: kind
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integer :: precision
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integer :: range
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end type real_info
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type (real_info) :: real_infos (c) = &
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(/real_info (4, precision (0.0_4), range (0.0_4)), &
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real_info (8, precision (0.0_8), range (0.0_8))/)
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selected_real_kind = 0
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p2 = 0
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r2 = 0
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found_p = .false.
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found_r = .false.
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if (present (p)) p2 = p
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if (present (r)) r2 = r
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! Assumes each type has a greater precision and range than previous one.
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do i = 1, c
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if (p2 <= real_infos (i) % precision) found_p = .true.
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if (r2 <= real_infos (i) % range) found_r = .true.
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if (found_p .and. found_r) then
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selected_real_kind = real_infos (i) % kind
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return
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end if
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end do
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if (.not. (found_p)) selected_real_kind = selected_real_kind - 1
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if (.not. (found_r)) selected_real_kind = selected_real_kind - 2
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return
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end function
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