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162 lines
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162 lines
6.2 KiB
Plaintext
NEWS for Mercury 11.01, 27 April 2011
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-------------------------------------
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Upcoming changes to the Mercury standard library:
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* In the next release after 11.01 we intend to change the argument order of
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many of the predicates in the standard library so as to make them more
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conducive to the use of state variable notation.
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For example, map.insert/4 will be changed from
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map.insert(map(K, V)::in, K::in, V::in, map(K, V)::out) is semidet.
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to
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map.insert(K::in, V::in, map(K, V)::in, map(K, V)::out) is semidet.
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As part of this change, the sv* modules will be deprecated; they will
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be removed from the library in a later release.
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Note that none of these upcoming changes affect the 11.01 release.
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HIGHLIGHTS
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==========
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Changes to the Mercury language:
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* We have added two new kinds of scopes to the language.
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A scope introduced by one of the new keywords require_det, require_semidet,
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require_multi, require_nondet, require_cc_multi, require_cc_nondet,
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require_erroneous and require_failure, as the name implies, requires
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the goal inside the scope to have the given determinism.
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A scope introduced by the keyword require_complete_switch requires the
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goal inside the scope, if it is a switch on the variable named by the scope,
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to be a complete switch, i.e. to have arms for all the function symbols
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in the type of the switched-on variable.
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Changes to the Mercury standard library:
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* We have added semidet modes for hash_table.fold/4 and
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version_hash_table.fold/4.
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* We have added new predicates and functions added to the assoc_list module.
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The predicates map_keys_only/3 map_values_only/3 and map_values/3 complement
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the functions of the same name. The predicates filter/3, negated_filter/3,
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filter/4, merge/3, which also have function versions, do jobs very similar
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to the predicates of the same name in the list module, but do the relevant
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operations on keys instead of entire list elements.
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+ We have moved the lazy evaluation module out of the extras distribution and
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into a new standard library module called `lazy'. It has also been made
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backend-agnostic.
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* We have made changes to the list module of the standard library:
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+ We added a new predicate list.member_index0/3. It is like list.member/2
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except that it also takes a parameter representing the zero-based index of
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the element within the list.
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+ We added a new predicate list.map3_foldl/7 which maps over a list producing
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three lists and one folded value.
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+ We added semidet modes with unique accumulators for list.foldl3/8,
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list.foldl4/10, list.foldl5/12, and list.foldl6/14.
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* We have added the predicates divide/4 and divide_by_set/4 to the tree_bitset
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module of the standard library.
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* We have added the predicates set_ctree234.member/2 and
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set_ctree234.non_empty/1. We have add the function
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set_ctree234.from_list/1.
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* We have added the predicate set_bbbtree.count/2 and the
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function set_bbbtree.count/1. These replace the predicate
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set_bbbtree.size/2 which is now deprecated.
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* We have added the predicate set_ordlist.non_empty/1.
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* We have added the predicate set_tree234.non_empty/1 and the
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function set_tree234.from_list/1.
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* We have added the predicates set_unordlist.non_empty/1 and
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set_unordlist.count/2, and the function set_unordlist.count/1.
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* All of the modules in the standard library that implement the set ADT,
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(set, set_ordlist, set_unordlist, set_bbbtree, set_tree234,
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and set_ctree234), now support folding over sets with up to six
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accumulators. Modes that provide unique and mostly-unique accumulators
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for set fold have also been added.
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* We have made the following changes to the array module of the standard
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library:
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+ We have added the functions unsafe_elem/2 and append/2.
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+ We have added the predicates svset/4, unsafe_svset/4, foldl2/4, foldl2/6,
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foldr/4, foldr2/6, map_foldl/5, map_corresponding_foldl/6, and member/2.
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* We have added the predicates version_array.foldl2/6, version_array.foldr/4,
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and version_array.foldr2/6 to the standard library.
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* We have added semidet modes with unique and mostly-unique accumulators for
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the following predicates:
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bimap.foldl2/6
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bimap.foldl3/8
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cord.foldl_pred/4
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cord.map_foldl/5
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list.map_corresponding_foldl2/8
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list.map_corresponding_foldl3/10
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list.map_corresponding3_foldl/7
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map.foldl3/8
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* We have added the predicate unsorted_aggregate2/6 to the solutions module
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of the standard library.
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* We have added several predicates and functions to the require module
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of the standard library. The predicates sorry/2 and sorry/3 report
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the absence of a feature, while the predicates unexpected/2 and unexpected/3
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report an internal error in the program; all have function versions too.
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The predicate expect/3 calls unexpected if a condition isn't satisfied.
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We now have expect/4 as well as expect/3. For expect/4 as well as expect/3,
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the first and last arguments are the expected condition and the error message
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respectively, but with expect/4, there are two arguments in the middle
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to specify the location of the error (normally the name of the module
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and of the predicate respectively). We also added expect_not/3 and
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expect_not/4, which are like expect/3 and expect/4 respectively,
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except they expect the condition to be *false*, not true.
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Changes to the Mercury compiler:
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* We have added a new backend that generates C#.
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* Support for building and linking against frameworks on Mac OS X has
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been improved.
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Changes to the extras distribution:
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* We have added a binding to the Cairo 2D graphics library.
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DETAILED LISTING
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================
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Changes to the Mercury compiler:
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* We have added a new backend that generates C#.
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For more details, see the README.CSharp.
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The new backend was contributed by Mission Critical IT
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<http://www.missioncriticalit.com/>.
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* We have added two new options, --framework and --framework-directory
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in order to simplify building and linking against frameworks on Mac OS X.
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(-F is supported as a synonym for --framework-directory.)
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* Switches on strings in which all output arguments in all switch arms are
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bound to constants are now implemented using lookup tables on the LLDS
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back end. This should make the generated code more compact as well as faster.
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