pm_io::isOpen Interface Reference

Generate and return .true. if the input file (or unit) is connected to a unit (or file), and .false. otherwise. More...

Detailed Description

Generate and return .true. if the input file (or unit) is connected to a unit (or file), and .false. otherwise.

This generic functional interface is a simple convenience wrapper around the Fortran intrinsic inquire() statement.

Parameters

[in]	unit	: The input scalar, or array of arbitrary rank, of type integer of default kind IK representing the file unit whose connection status is to be checked. (optional, it must be present if and only if the input argument file is missing.)
[in]	file	: The input scalar, or array of arbitrary rank, of type character of default kind SK representing the file path whose connection status is to be checked. (optional, it must be present if and only if the input argument unit is missing.)

Returns

opened : The output scalar, or array of same rank, shape, and size as the input array-like argument, of type logical of default kind LK.
It is .true. if and only if the input unit or file is already connected (opened).
Otherwise, it is .false..

Possible calling interfaces ⛓

use pm_io, only: isOpen
use pm_kind, only: LK
logical(LK) :: opened
 
opened = isOpen(unit)
opened = isOpen(file)

Warning

This procedure does not gracefully handle unexpected runtime errors.
If error handling is needed, use the Fortran intrinsic inquire() with arguments iostat and iomsg present.

Remarks

The procedures under discussion are impure.

The procedures under discussion are elemental.

See also

isPreconnected

Example usage ⛓

program example
 
    use iso_fortran_env, only: output_unit, input_unit, error_unit
    use pm_kind, only: SK, IK, LK
    use pm_io, only: display_type
    use pm_io, only: isOpen
 
    implicit none
 
    integer(IK) :: unit
    type(display_type) :: disp
 
    disp = display_type(file = "main.out.F90")
 
    call disp%skip
    call disp%show("isOpen('temp.tmp')")
    call disp%show( isOpen('temp.tmp') )
    call disp%skip
 
    call disp%skip
    call disp%show("open(newunit = unit, file = 'temp.tmp')")
                    open(newunit = unit, file = 'temp.tmp')
    call disp%show("isOpen('temp.tmp')")
    call disp%show( isOpen('temp.tmp') )
    call disp%show("isOpen(unit)")
    call disp%show( isOpen(unit) )
    call disp%skip
 
    call disp%skip
    call disp%show("isOpen([output_unit, input_unit, error_unit])")
    call disp%show( isOpen([output_unit, input_unit, error_unit]) )
    call disp%skip
 
end program example

Example Unix compile command via Intel ifort compiler ⛓

#!/usr/bin/env sh
rm main.exe
ifort -fpp -standard-semantics -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
./main.exe

Example Windows Batch compile command via Intel ifort compiler ⛓

del main.exe
set PATH=..\..\..\lib;%PATH%
ifort /fpp /standard-semantics /O3 /I:..\..\..\include main.F90 ..\..\..\lib\libparamonte*.lib /exe:main.exe
main.exe

Example Unix / MinGW compile command via GNU gfortran compiler ⛓

#!/usr/bin/env sh
rm main.exe
gfortran -cpp -ffree-line-length-none -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
./main.exe

Example output ⛓

 
isOpen('temp.tmp')
F
 
 
open(newunit = unit, file = 'temp.tmp')
isOpen('temp.tmp')
T
isOpen(unit)
T
 
 
isOpen([output_unit, input_unit, error_unit])
T, T, T
 
 

Test:

test_pm_io

Final Remarks ⛓

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Copyright

Computational Data Science Lab

Author:

Amir Shahmoradi, Tuesday March 7, 2017, 3:50 AM, Institute for Computational Engineering and Sciences (ICES), The University of Texas Austin

Definition at line 1289 of file pm_io.F90.

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The documentation for this interface was generated from the following file:

• src/fortran/main/pm_io.F90