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Diffstat (limited to 'lib/stdlib/doc/src/notes.xml')
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diff --git a/lib/stdlib/doc/src/notes.xml b/lib/stdlib/doc/src/notes.xml index 76d49e37c2..87f5335723 100644 --- a/lib/stdlib/doc/src/notes.xml +++ b/lib/stdlib/doc/src/notes.xml @@ -31,267 +31,6 @@ </header> <p>This document describes the changes made to the STDLIB application.</p> -<section><title>STDLIB 3.0</title> - - <section><title>Fixed Bugs and Malfunctions</title> - <list> - <item> - <p> Fix a race bug affecting <c>dets:open_file/2</c>. - </p> - <p> - Own Id: OTP-13260 Aux Id: seq13002 </p> - </item> - <item> - <p>Don't search for non-existing Map keys twice</p> - <p>For <c>maps:get/2,3</c> and <c>maps:find/2</c>, - searching for an immediate key, e.g. an atom, in a small - map, the search was performed twice if the key did not - exist.</p> - <p> - Own Id: OTP-13459</p> - </item> - <item> - <p> - Avoid stray corner-case math errors on Solaris, e.g. an - error is thrown on undeflows in exp() and pow() when it - shouldn't be.</p> - <p> - Own Id: OTP-13531</p> - </item> - <item> - <p>Fix linting of map key variables</p> - <p>Map keys cannot be unbound and then used in parallel - matching.</p> - <p>Example: <c> #{ K := V } = #{ k := K } = M.</c> This - is illegal if <c>'K'</c> is not bound.</p> - <p> - Own Id: OTP-13534 Aux Id: ERL-135 </p> - </item> - </list> - </section> - - - <section><title>Improvements and New Features</title> - <list> - <item> - <p>The types of The Abstract Format in the - <c>erl_parse</c> module have been refined. </p> - <p> - Own Id: OTP-10292</p> - </item> - <item> - <p> Undocumented syntax for function specifications, - <c>-spec F/A :: Domain -> Range</c>, has been removed - (without deprecation). </p> <p> Using the - <c>is_subtype(V, T)</c> syntax for constraints (in - function specifications) is no longer documented, and the - newer syntax <c>V :: T</c> should be used instead. The - Erlang Parser still recognizes the <c>is_subtype</c> - syntax, and will continue to do so for some time. </p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-11879</p> - </item> - <item> - <p>The '<c>random</c>' module has been deprecated. Use - the '<c>rand</c>' module instead.</p> - <p> - Own Id: OTP-12502 Aux Id: OTP-12501 </p> - </item> - <item> - <p>Background: In record fields with a type declaration - but without an initializer, the Erlang parser inserted - automatically the singleton type <c>'undefined'</c> to - the list of declared types, if that value was not present - there. That is, the record declaration:</p> - <p> - -record(rec, {f1 :: float(), f2 = 42 :: integer(), f3 :: - some_mod:some_typ()}).</p> - <p>was translated by the parser to:</p> - <p> - -record(rec, {f1 :: float() | 'undefined', f2 = 42 :: - integer(), f3 :: some_mod:some_typ() | 'undefined'}).</p> - <p>The rationale for this was that creation of a "dummy" - <c>#rec{}</c> record should not result in a warning from - dialyzer that, for example, the implicit initialization - of the <c>#rec.f1</c> field violates its type - declaration.</p> - <p>Problems: This seemingly innocent action has some - unforeseen consequences.</p> - <p>For starters, there is no way for programmers to - declare that e.g. only floats make sense for the - <c>f1</c> field of <c>#rec{}</c> records when there is no - "obvious" default initializer for this field. (This also - affects tools like PropEr that use these declarations - produced by the Erlang parser to generate random - instances of records for testing purposes.)</p> - <p>It also means that dialyzer does not warn if e.g. an - <c>is_atom/1</c> test or something more exotic like an - <c>atom_to_list/1</c> call is performed on the value of - the <c>f1</c> field.</p> - <p>Similarly, there is no way to extend dialyzer to warn - if it finds record constructions where <c>f1</c> is not - initialized to some float.</p> - <p>Last but not least, it is semantically problematic - when the type of the field is an opaque type: creating a - union of an opaque and a structured type is very - problematic for analysis because it fundamentally breaks - the opacity of the term at that point.</p> - <p>Change: To solve these problems the parser will not - automatically insert the <c>'undefined'</c> value - anymore; instead the user has the option to choose the - places where this value makes sense (for the field) and - where it does not and insert the <c>| 'undefined'</c> - there manually.</p> - <p>Consequences of this change: This change means that - dialyzer will issue a warning for all places where - records with uninitialized fields are created and those - fields have a declared type that is incompatible with - <c>'undefined'</c> (e.g. <c>float()</c>). This warning - can be suppressed easily by adding <c>| 'undefined'</c> - to the type of this field. This also adds documentation - that the user really intends to create records where this - field is uninitialized.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-12719</p> - </item> - <item> - <p> Remove deprecated functions in the modules - <c>erl_scan</c> and <c>erl_parse</c>. </p> - <p> - Own Id: OTP-12861</p> - </item> - <item> - <p>The pre-processor can now expand the ?FUNCTION_NAME - and ?FUNCTION_ARITY macros.</p> - <p> - Own Id: OTP-13059</p> - </item> - <item> - <p> A new behaviour <c>gen_statem</c> has been - implemented. It has been thoroughly reviewed, is stable - enough to be used by at least two heavy OTP applications, - and is here to stay. But depending on user feedback, we - do not expect but might find it necessary to make minor - not backwards compatible changes into OTP-20.0, so its - state can be designated as "not quite experimental"... - </p> <p> The <c>gen_statem</c> behaviour is intended to - replace <c>gen_fsm</c> for new code. It has the same - features and add some really useful: </p> <list - type="bulleted"> <item>State code is gathered</item> - <item>The state can be any term</item> <item>Events can - be postponed</item> <item>Events can be self - generated</item> <item>A reply can be sent from a later - state</item> <item>There can be multiple sys traceable - replies</item> </list> <p> The callback model(s) for - <c>gen_statem</c> differs from the one for - <c>gen_fsm</c>, but it is still fairly easy to rewrite - from <c>gen_fsm</c> to <c>gen_statem</c>. </p> - <p> - Own Id: OTP-13065 Aux Id: PR-960 </p> - </item> - <item> - <p> - Optimize binary:split/2 and binary:split/3 with native - BIF implementation.</p> - <p> - Own Id: OTP-13082</p> - </item> - <item> - <p>Background: The types of record fields have since R12B - been put in a separate form by <c>epp:parse_file()</c>, - leaving the record declaration form untyped. The separate - form, however, does not follow the syntax of type - declarations, and parse transforms inspecting - <c>-type()</c> attributes need to know about the special - syntax. Since the compiler stores the return value of - <c>epp:parse_file()</c> as debug information in the - abstract code chunk (<c>"Abst"</c> or - <c>abstract_code</c>), tools too need to know about the - special syntax, if they inspect <c>-type()</c> attributes - in abstract code.</p> - <p>Change: No separate type form is created by - <c>epp:parse_file()</c>, but the type information is kept - in the record fields. This means that all parse - transforms and all tools inspecting <c>-record()</c> - declarations need to recognize <c>{typed_record_field, - Field, Type}</c>.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-13148</p> - </item> - <item> - <p> - Unsized fields of the type <c>bytes</c> in binary - generators are now forbidden. (The other ways of writing - unsized fields, such as <c>binary</c>, are already - forbidden.)</p> - <p> - Own Id: OTP-13152</p> - </item> - <item> - <p> The type <c>map()</c> is built-in, and cannot be - redefined. </p> - <p> - Own Id: OTP-13153</p> - </item> - <item> - <p> Let <c>dets:open_file()</c> exit with a <c>badarg</c> - message if given a raw file name (a binary). </p> - <p> - Own Id: OTP-13229 Aux Id: ERL-55 </p> - </item> - <item> - <p> Add <c>filename:basedir/2,3</c></p> <p>basedir - returns suitable path(s) for 'user_cache', 'user_config', - 'user_data', 'user_log', 'site_config' and 'site_data'. - On linux and linux like systems the paths will respect - the XDG environment variables.</p> - <p> - Own Id: OTP-13392</p> - </item> - <item> - <p>There are new preprocessor directives - <c>-error(Term)</c> and <c>-warning(Term)</c> to cause a - compilation error or a compilation warning, - respectively.</p> - <p> - Own Id: OTP-13476</p> - </item> - <item> - <p> - Optimize <c>'++'</c> operator and <c>lists:append/2</c> - by using a single pass to build a new list while checking - for properness.</p> - <p> - Own Id: OTP-13487</p> - </item> - <item> - <p> - Add <c>maps:update_with/3,4</c> and <c>maps:take/2</c></p> - <p> - Own Id: OTP-13522 Aux Id: PR-1025 </p> - </item> - <item> - <p><c>lists:join/2</c> has been added. Similar to - <c>string:join/2</c> but works with arbitrary lists.</p> - <p> - Own Id: OTP-13523</p> - </item> - <item> - <p>Obfuscate asserts to make Dialyzer shut up.</p> - <p> - Own Id: OTP-13524 Aux Id: PR-1002 </p> - </item> - </list> - </section> - -</section> - <section><title>STDLIB 2.8</title> <section><title>Fixed Bugs and Malfunctions</title> |