9.1 ISO_FORTRAN_ENV

Standard:

Fortran 2003 and later, except when otherwise noted

The ISO_FORTRAN_ENV module provides the following scalar default-integer named constants:

ATOMIC_INT_KIND:

Default-kind integer constant to be used as kind parameter when defining integer variables used in atomic operations. (Fortran 2008 or later.)

ATOMIC_LOGICAL_KIND:

Default-kind integer constant to be used as kind parameter when defining logical variables used in atomic operations. (Fortran 2008 or later.)

CHARACTER_KINDS:

Default-kind integer constant array of rank one containing the supported kind parameters of the CHARACTER type. (Fortran 2008 or later.)

CHARACTER_STORAGE_SIZE:

Size in bits of the character storage unit.

ERROR_UNIT:

Identifies the preconnected unit used for error reporting.

FILE_STORAGE_SIZE:

Size in bits of the file-storage unit.

INPUT_UNIT:

Identifies the preconnected unit identified by the asterisk (*) in READ statement.

INT8, INT16, INT32, INT64:

Kind type parameters to specify an INTEGER type with a storage size of 16, 32, and 64 bits. It is negative if a target platform does not support the particular kind. (Fortran 2008 or later.)

INTEGER_KINDS:

Default-kind integer constant array of rank one containing the supported kind parameters of the INTEGER type. (Fortran 2008 or later.)

IOSTAT_END:

The value assigned to the variable passed to the IOSTAT= specifier of an input/output statement if an end-of-file condition occurred.

IOSTAT_EOR:

The value assigned to the variable passed to the IOSTAT= specifier of an input/output statement if an end-of-record condition occurred.

IOSTAT_INQUIRE_INTERNAL_UNIT:

Scalar default-integer constant, used by INQUIRE for the IOSTAT= specifier to denote an that a unit number identifies an internal unit. (Fortran 2008 or later.)

NUMERIC_STORAGE_SIZE:

The size in bits of the numeric storage unit.

LOGICAL_KINDS:

Default-kind integer constant array of rank one containing the supported kind parameters of the LOGICAL type. (Fortran 2008 or later.)

OUTPUT_UNIT:

Identifies the preconnected unit identified by the asterisk (*) in WRITE statement.

REAL32, REAL64, REAL128:

Kind type parameters to specify a REAL type with a storage size of 32, 64, and 128 bits. It is negative if a target platform does not support the particular kind. (Fortran 2008 or later.)

REAL_KINDS:

Default-kind integer constant array of rank one containing the supported kind parameters of the REAL type. (Fortran 2008 or later.)

STAT_LOCKED:

Scalar default-integer constant used as STAT= return value by LOCK to denote that the lock variable is locked by the executing image. (Fortran 2008 or later.)

STAT_LOCKED_OTHER_IMAGE:

Scalar default-integer constant used as STAT= return value by UNLOCK to denote that the lock variable is locked by another image. (Fortran 2008 or later.)

STAT_STOPPED_IMAGE:

Positive, scalar default-integer constant used as STAT= return value if the argument in the statement requires synchronisation with an image, which has initiated the termination of the execution. (Fortran 2008 or later.)

STAT_UNLOCKED:

Scalar default-integer constant used as STAT= return value by UNLOCK to denote that the lock variable is unlocked. (Fortran 2008 or later.)

The module provides the following derived type:

LOCK_TYPE:

Derived type with private components to be use with the LOCK and UNLOCK statement. A variable of its type has to be always declared as coarray and may not appear in a variable-definition context. (Fortran 2008 or later.)

The module also provides the following intrinsic procedures: COMPILER_OPTIONS and COMPILER_VERSION.