Fortran 2003 Features

The following Fortran 2003 features are new in this release:

• A polymorphic dummy argument that has the attribute INTENT(OUT) becomes UNDEFINED or it will have DEFAULT INITIALIZATION applied.

• User-Defined Derived-Type I/O

The following Fortran 2003 features are also supported:

• A polymorphic SOURCE= specifier for ALLOCATE

• Bounds specification and bounds remapping list on a pointer assignment

• FINAL routines

• GENERIC, OPERATOR, and ASSIGNMENT overloading in type-bound procedures

• Enumerators

• Type extension (not polymorphic)

• Type-bound procedures

• Allocatable scalar variables (not deferred-length character)

• ERRMSG keyword for ALLOCATE and DEALLOCATE

• SOURCE= keyword for ALLOCATE

• Character arguments for MAX, MIN, MAXVAL, MINVAL, MAXLOC, and MINLOC

• Intrinsic modules IEEE_EXCEPTIONS, IEEE_ARITHMETIC and IEEE_FEATURES

• ASSOCIATE construct

• DO CONCURRENT construct

• PROCEDURE declaration

• Procedure pointers

• ABSTRACT INTERFACE

• PASS and NOPASS attributes

• CONTIGUOUS attribute

• Structure constructors with component names and default initialization

• Array constructors with type and character length specifications

• I/O keywords BLANK, DECIMAL, DELIM, ENCODING, IOMSG, PAD, ROUND, SIGN, and SIZE

• Format edit descriptors DC, DP, RD, RC, RN, RP, RU, and RZ

• The COUNT_RATE argument to the SYSTEM_CLOCK intrinsic may be a REAL of any kind.

• NAMELIST I/O for internal files

• Intrinsic functions EXTENDS_TYPE_OF and SAME_TYPE_AS

• SELECT TYPE construct

• CLASS declaration

• PUBLIC types with PRIVATE components and PRIVATE types with PUBLIC components

• RECORDTYPE setting STREAM_CRLF

• A file can be opened for stream access (ACCESS='STREAM')

• Specifier POS can be specified in an INQUIRE, READ, or WRITE statement

• BIND attribute and statement

• Language binding can be specified in a FUNCTION or SUBROUTINE statement, or when defining a derived type

• IS_IOSTAT_END intrinsic function

• IS_IOSTAT_EOR intrinsic function

• INTRINSIC and NONINTRINSIC can be specified for modules in USE statements

• ASYNCHRONOUS attribute and statement

• VALUE attribute and statement

• Specifier ASYNCHRONOUS can be specified in an OPEN, INQUIRE, READ, or WRITE statement

• An ID can be specified for a pending data transfer operation

• FLUSH statement

• WAIT statement

• IMPORT statement

• NEW_LINE intrinsic function

• SELECTED_CHAR_KIND intrinsic function

• Intrinsic modules ISO_C_BINDING and ISO_FORTRAN_ENV

• Specifiers ID and PENDING can be specified in an INQUIRE statement

• User-defined operators can be renamed in USE statements

• MOVE_ALLOC intrinsic subroutine

• PROTECTED attribute and statement

• Pointer objects can have the INTENT attribute

• GET_COMMAND intrinsic

• GET_COMMAND_ARGUMENT intrinsic

• COMMAND_ARGUMENT_COUNT intrinsic

• GET_ENVIRONMENT_VARIABLE intrinsic

• Allocatable components of derived types

• Allocatable dummy arguments

• Allocatable function results

• VOLATILE attribute and statement

• Names of length up to 63 characters

• Statements up to 256 lines

• A named PARAMETER constant may be part of a complex constant

• In all I/O statements, the following numeric values can be of any kind: UNIT=, IOSTAT=

• The following OPEN numeric values can be of any kind: RECL=

• The following READ and WRITE numeric values can be of any kind: REC=, SIZE=

• The following INQUIRE numeric values can be of any kind: NEXTREC=, NUMBER=, RECL=, SIZE=

• Recursive I/O is allowed when the new I/O being started is internal I/O that does not modify any internal file other than its own

• IEEE infinities and Nans are displayed by formatted output as specified by Fortran 2003

• In an I/O format, the comma after a P edit descriptor is optional when followed by a repeat specifier

• The following intrinsics take an optional KIND= argument: ACHAR, COUNT, IACHAR, ICHAR, INDEX, LBOUND, LEN, LEN_TRIM, MAXLOC, MINLOC, SCAN, SHAPE, SIZE, UBOUND, VERIFY

• Square brackets [ ] are permitted to delimit array constructors instead of (/ /)

• The Fortran character set has been extended to contain the 8-bit ASCII characters ~ \ [ ] ` ^ { } | # @