8 Intrinsic Modules

8.1 ISO_FORTRAN_ENV

Standard:

Fortran 2003 and later

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

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.

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.

NUMERIC_STORAGE_SIZE:

The size in bits of the numeric storage unit.

OUTPUT_UNIT:

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

8.2 ISO_C_BINDING

Standard:

Fortran 2003 and later, GNU extensions

The following intrinsic procedures are provided by the module; their definition can be found in the section Intrinsic Procedures of this manual.

C_ASSOCIATED

C_F_POINTER

C_F_PROCPOINTER

C_FUNLOC

C_LOC

The ISO_C_BINDING module provides the following named constants of the type integer, which can be used as KIND type parameter. Note that GNU Fortran currently does not support the C_INT_FAST... KIND type parameters (marked by an asterisk (*) in the list below). The C_INT_FAST... parameters have therefore the value -2 and cannot be used as KIND type parameter of the INTEGER type.

In addition to the integer named constants required by the Fortran 2003 standard, GNU Fortran provides as an extension named constants for the 128-bit integer types supported by the C compiler: C_INT128_T, C_INT_LEAST128_T, C_INT_FAST128_T.

Fortran Type	Named constant	C type	Extension
INTEGER	C_INT	int
INTEGER	C_SHORT	short int
INTEGER	C_LONG	long int
INTEGER	C_LONG_LONG	long long int
INTEGER	C_SIGNED_CHAR	signed char/unsigned char
INTEGER	C_SIZE_T	size_t
INTEGER	C_INT8_T	int8_t
INTEGER	C_INT16_T	int16_t
INTEGER	C_INT32_T	int32_t
INTEGER	C_INT64_T	int64_t
INTEGER	C_INT128_T	int128_t	Ext.
INTEGER	C_INT_LEAST8_T	int_least8_t
INTEGER	C_INT_LEAST16_T	int_least16_t
INTEGER	C_INT_LEAST32_T	int_least32_t
INTEGER	C_INT_LEAST64_T	int_least64_t
INTEGER	C_INT_LEAST128_T	int_least128_t	Ext.
INTEGER	C_INT_FAST8_T*	int_fast8_t
INTEGER	C_INT_FAST16_T*	int_fast16_t
INTEGER	C_INT_FAST32_T*	int_fast32_t
INTEGER	C_INT_FAST64_T*	int_fast64_t
INTEGER	C_INT_FAST128_T*	int_fast128_t	Ext.
INTEGER	C_INTMAX_T	intmax_t
INTEGER	C_INTPTR_T	intptr_t
REAL	C_FLOAT	float
REAL	C_DOUBLE	double
REAL	C_LONG_DOUBLE	long double
COMPLEX	C_FLOAT_COMPLEX	float _Complex
COMPLEX	C_DOUBLE_COMPLEX	double _Complex
COMPLEX	C_LONG_DOUBLE_COMPLEX	long double _Complex
LOGICAL	C_BOOL	_Bool
CHARACTER	C_CHAR	char

Additionally, the following (CHARACTER(KIND=C_CHAR)) are defined.

Name	C definition	Value
C_NULL_CHAR	null character	'\0'
C_ALERT	alert	'\a'
C_BACKSPACE	backspace	'\b'
C_FORM_FEED	form feed	'\f'
C_NEW_LINE	new line	'\n'
C_CARRIAGE_RETURN	carriage return	'\r'
C_HORIZONTAL_TAB	horizontal tab	'\t'
C_VERTICAL_TAB	vertical tab	'\v'

8.3 OpenMP Modules OMP_LIB and OMP_LIB_KINDS

Standard:

OpenMP Application Program Interface v3.0

The OpenMP Fortran runtime library routines are provided both in a form of two Fortran 90 modules, named OMP_LIB and OMP_LIB_KINDS, and in a form of a Fortran include file named omp_lib.h. The procedures provided by OMP_LIB can be found in the Introduction manual, the named constants defined in the OMP_LIB_KINDS module are listed below.

For details refer to the actual OpenMP Application Program Interface v3.0.

OMP_LIB_KINDS provides the following scalar default-integer named constants:

omp_integer_kind

omp_logical_kind

omp_lock_kind

omp_nest_lock_kind

omp_sched_kind