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<title>The GNU Fortran Compiler: Fortran 2003 status</title>
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<a name="Fortran-2003-status"></a>
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<p>
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Next: <a href="Fortran-2008-status.html#Fortran-2008-status" accesskey="n" rel="next">Fortran 2008 status</a>, Up: <a href="Fortran-2003-and-2008-status.html#Fortran-2003-and-2008-status" accesskey="u" rel="up">Fortran 2003 and 2008 status</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Fortran-2003-status-1"></a>
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<h3 class="section">4.1 Fortran 2003 status</h3>
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<p>GNU Fortran supports several Fortran 2003 features; an incomplete
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list can be found below. See also the
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<a href="https://gcc.gnu.org/wiki/Fortran2003">wiki page</a> about Fortran 2003.
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</p>
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<ul>
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<li> Procedure pointers including procedure-pointer components with
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<code>PASS</code> attribute.
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</li><li> Procedures which are bound to a derived type (type-bound procedures)
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including <code>PASS</code>, <code>PROCEDURE</code> and <code>GENERIC</code>, and
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operators bound to a type.
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</li><li> Abstract interfaces and type extension with the possibility to
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override type-bound procedures or to have deferred binding.
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</li><li> Polymorphic entities (“<code>CLASS</code>”) for derived types and unlimited
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polymorphism (“<code>CLASS(*)</code>”) – including <code>SAME_TYPE_AS</code>,
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<code>EXTENDS_TYPE_OF</code> and <code>SELECT TYPE</code> for scalars and arrays and
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finalization.
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</li><li> Generic interface names, which have the same name as derived types,
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are now supported. This allows one to write constructor functions. Note
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that Fortran does not support static constructor functions. For static
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variables, only default initialization or structure-constructor
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initialization are available.
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</li><li> The <code>ASSOCIATE</code> construct.
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</li><li> Interoperability with C including enumerations,
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</li><li> In structure constructors the components with default values may be
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omitted.
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</li><li> Extensions to the <code>ALLOCATE</code> statement, allowing for a
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type-specification with type parameter and for allocation and initialization
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from a <code>SOURCE=</code> expression; <code>ALLOCATE</code> and <code>DEALLOCATE</code>
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optionally return an error message string via <code>ERRMSG=</code>.
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</li><li> Reallocation on assignment: If an intrinsic assignment is
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used, an allocatable variable on the left-hand side is automatically allocated
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(if unallocated) or reallocated (if the shape is different). Currently, scalar
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deferred character length left-hand sides are correctly handled but arrays
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are not yet fully implemented.
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</li><li> Deferred-length character variables and scalar deferred-length character
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components of derived types are supported. (Note that array-valued compoents
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are not yet implemented.)
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</li><li> Transferring of allocations via <code>MOVE_ALLOC</code>.
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</li><li> The <code>PRIVATE</code> and <code>PUBLIC</code> attributes may be given individually
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to derived-type components.
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</li><li> In pointer assignments, the lower bound may be specified and
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the remapping of elements is supported.
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</li><li> For pointers an <code>INTENT</code> may be specified which affect the
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association status not the value of the pointer target.
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</li><li> Intrinsics <code>command_argument_count</code>, <code>get_command</code>,
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<code>get_command_argument</code>, and <code>get_environment_variable</code>.
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</li><li> Support for Unicode characters (ISO 10646) and UTF-8, including
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the <code>SELECTED_CHAR_KIND</code> and <code>NEW_LINE</code> intrinsic functions.
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</li><li> Support for binary, octal and hexadecimal (BOZ) constants in the
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intrinsic functions <code>INT</code>, <code>REAL</code>, <code>CMPLX</code> and <code>DBLE</code>.
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</li><li> Support for namelist variables with allocatable and pointer
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attribute and nonconstant length type parameter.
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</li><li> <a name="index-array_002c-constructors"></a>
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<a name="index-_005b_002e_002e_002e_005d"></a>
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Array constructors using square brackets. That is, <code>[...]</code> rather
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than <code>(/.../)</code>. Type-specification for array constructors like
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<code>(/ some-type :: ... /)</code>.
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</li><li> Extensions to the specification and initialization expressions,
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including the support for intrinsics with real and complex arguments.
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</li><li> Support for the asynchronous input/output syntax; however, the
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data transfer is currently always synchronously performed.
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</li><li> <a name="index-FLUSH-statement"></a>
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<a name="index-statement_002c-FLUSH"></a>
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<code>FLUSH</code> statement.
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</li><li> <a name="index-IOMSG_003d-specifier"></a>
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<code>IOMSG=</code> specifier for I/O statements.
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</li><li> <a name="index-ENUM-statement"></a>
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<a name="index-ENUMERATOR-statement"></a>
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<a name="index-statement_002c-ENUM"></a>
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<a name="index-statement_002c-ENUMERATOR"></a>
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<a name="index-fshort_002denums-1"></a>
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Support for the declaration of enumeration constants via the
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<code>ENUM</code> and <code>ENUMERATOR</code> statements. Interoperability with
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<code>gcc</code> is guaranteed also for the case where the
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<code>-fshort-enums</code> command line option is given.
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</li><li> <a name="index-TR-15581"></a>
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TR 15581:
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<ul>
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<li> <a name="index-ALLOCATABLE-dummy-arguments"></a>
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<code>ALLOCATABLE</code> dummy arguments.
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</li><li> <a name="index-ALLOCATABLE-function-results"></a>
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<code>ALLOCATABLE</code> function results
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</li><li> <a name="index-ALLOCATABLE-components-of-derived-types"></a>
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<code>ALLOCATABLE</code> components of derived types
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</li></ul>
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</li><li> <a name="index-STREAM-I_002fO"></a>
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<a name="index-ACCESS_003d_0027STREAM_0027-I_002fO"></a>
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The <code>OPEN</code> statement supports the <code>ACCESS='STREAM'</code> specifier,
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allowing I/O without any record structure.
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</li><li> Namelist input/output for internal files.
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</li><li> Minor I/O features: Rounding during formatted output, using of
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a decimal comma instead of a decimal point, setting whether a plus sign
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should appear for positive numbers. On systems where <code>strtod</code> honours
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the rounding mode, the rounding mode is also supported for input.
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</li><li> <a name="index-PROTECTED-statement"></a>
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<a name="index-statement_002c-PROTECTED"></a>
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The <code>PROTECTED</code> statement and attribute.
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</li><li> <a name="index-VALUE-statement"></a>
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<a name="index-statement_002c-VALUE"></a>
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The <code>VALUE</code> statement and attribute.
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</li><li> <a name="index-VOLATILE-statement"></a>
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<a name="index-statement_002c-VOLATILE"></a>
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The <code>VOLATILE</code> statement and attribute.
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</li><li> <a name="index-IMPORT-statement"></a>
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<a name="index-statement_002c-IMPORT"></a>
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The <code>IMPORT</code> statement, allowing to import
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host-associated derived types.
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</li><li> The intrinsic modules <code>ISO_FORTRAN_ENVIRONMENT</code> is supported,
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which contains parameters of the I/O units, storage sizes. Additionally,
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procedures for C interoperability are available in the <code>ISO_C_BINDING</code>
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module.
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</li><li> <a name="index-USE_002c-INTRINSIC-statement"></a>
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<a name="index-statement_002c-USE_002c-INTRINSIC"></a>
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<a name="index-ISO_005fFORTRAN_005fENV-statement"></a>
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<a name="index-statement_002c-ISO_005fFORTRAN_005fENV"></a>
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<code>USE</code> statement with <code>INTRINSIC</code> and <code>NON_INTRINSIC</code>
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attribute; supported intrinsic modules: <code>ISO_FORTRAN_ENV</code>,
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<code>ISO_C_BINDING</code>, <code>OMP_LIB</code> and <code>OMP_LIB_KINDS</code>,
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and <code>OPENACC</code>.
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</li><li> Renaming of operators in the <code>USE</code> statement.
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</li></ul>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Fortran-2008-status.html#Fortran-2008-status" accesskey="n" rel="next">Fortran 2008 status</a>, Up: <a href="Fortran-2003-and-2008-status.html#Fortran-2003-and-2008-status" accesskey="u" rel="up">Fortran 2003 and 2008 status</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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