61 lines
2.1 KiB
Plaintext
61 lines
2.1 KiB
Plaintext
$Id$
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This document attempts to describe the features separating Harbour from
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Clipper.
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/* TODO: @FunPointer(), and all other Harbour extensions. */
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Harbour Macro Compiler
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----------------------
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The Harbour Macro Compiler offers 2 additional layers of functionality
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controlled by means of HB_SETMACRO()* function, not available in Clipper.
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HB_SETMACRO( HB_SM_HARBOUR, TRUE ) will enable macro compilation and
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evaluation of complex expressions not supported by Clipper like:
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- exp++, exp--, var += exp, (exp), etc..
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- Nested codeblocks.
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- Expressions longer then 254 characters.
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HB_SETMACRO( HB_SM_XBASE, TRUE ) will enable macro compilation and
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evaluation of comma separated lists in all contexts where lists are
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acceptable by Clipper*, including:
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- { &cMacro } // Literal array elements list.
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- SomeArray[ &cMacro ] // Array index list.
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- SomeFun( &cMacro ) // Arguments list.
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- ( &cMacro ) // parenthesized list expression.
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*Clipper only supports list macros within codeblocks context.
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Both these extra layers are activated by default.
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* See also -k Compiler switch.
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LIST Command
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------------
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LIST &cMacro
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LIST in clipper [superficially] supports macros of lists expressions.
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No error will be produced, and all expressions in the list will be
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evaluated, but *only* the *last* expression will be displayed. This is
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not documented in either the LIST Command or the Macro Operator
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descriptions, but is the de-facto behavior in all Clipper 5.x versions.
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Harbour instead will not only evaluate all of the expressions in
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such list macro, but will also display all such values. This default
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behavior may be disabled with HB_SETMACRO( HB_SM_XBASE, .F. )*
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* See also -k Compiler switch.
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INIT/EXIT and startup procedures
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--------------------------------
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In Clipper the startup procedure is always the first procedure/function
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of the main module, even if such symbol is an INIT or EXIT symbol. In
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such case the program will never execute the "main" symbol. In Harbour
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the first *non* INIT/EXIT symbol, will be executed as the main symbol
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after all INIT procedures have been executed.
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