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