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ISO_C_BINDINGFortran 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_ASSOCIATEDC_F_POINTERC_F_PROCPOINTERC_FUNLOCC_LOCC_SIZEOFThe ISO_C_BINDING module provides the following named constants of
type default integer, which can be used as KIND type parameters.
In addition to the integer named constants required by the Fortran 2003
standard and C_PTRDIFF_T of TS 29113, 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.
Furthermore, if __float128 is supported in C, the named constants
C_FLOAT128, C_FLOAT128_COMPLEX are defined.
| 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 | |
INTEGER | C_PTRDIFF_T | intptr_t | TS 29113 |
REAL | C_FLOAT | float | |
REAL | C_DOUBLE | double | |
REAL | C_LONG_DOUBLE | long double | |
REAL | C_FLOAT128 | __float128 | Ext. |
COMPLEX | C_FLOAT_COMPLEX | float _Complex | |
COMPLEX | C_DOUBLE_COMPLEX | double _Complex | |
COMPLEX | C_LONG_DOUBLE_COMPLEX | long double _Complex | |
REAL | C_FLOAT128_COMPLEX | __float128 _Complex | Ext. |
LOGICAL | C_BOOL | _Bool | |
CHARACTER | C_CHAR | char |
Additionally, the following parameters of type 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' |
Moreover, the following two named constants are defined:
| Name | Type |
C_NULL_PTR | C_PTR |
C_NULL_FUNPTR | C_FUNPTR |
Both are equivalent to the value NULL in C.
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