perlmroapi - Perl method resolution plugin interface

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The C3 method resolution order added in 5.10.0 has been re-implemented as a plugin, without changing its Perl-space interface.</p> <p>Each plugin should register itself by providing the following structure</p> <pre><code>struct mro_alg { AV *(*resolve)(pTHX_ HV *stash, U32 level); const char *name; U16 length; U16 kflags; U32 hash; };</code></pre> <p>and calling <code>Perl_mro_register</code>:</p> <pre><code>Perl_mro_register(aTHX_ &my_mro_alg);</code></pre> <dl> <dt id="resolve"><a class="permalink" href="#resolve">#</a>resolve</dt> <dd> <p>Pointer to the linearisation function, described below.</p> </dd> <dt id="name"><a class="permalink" href="#name">#</a>name</dt> <dd> <p>Name of the MRO, either in ISO-8859-1 or UTF-8.</p> </dd> <dt id="length"><a class="permalink" href="#length">#</a>length</dt> <dd> <p>Length of the name.</p> </dd> <dt id="kflags"><a class="permalink" href="#kflags">#</a>kflags</dt> <dd> <p>If the name is given in UTF-8, set this to <code>HVhek_UTF8</code>. The value is passed direct as the parameter <i>kflags</i> to <code>hv_common()</code>.</p> </dd> <dt id="hash"><a class="permalink" href="#hash">#</a>hash</dt> <dd> <p>A precomputed hash value for the MRO's name, or 0.</p> </dd> </dl> <h1 id="Callbacks"><a class="permalink" href="#Callbacks">#</a>Callbacks</h1> <p>The <code>resolve</code> function is called to generate a linearised ISA for the given stash, using this MRO. It is called with a pointer to the stash, and a <i>level</i> of 0. The core always sets <i>level</i> to 0 when it calls your function - the parameter is provided to allow your implementation to track depth if it needs to recurse.</p> <p>The function should return a reference to an array containing the parent classes in order. The names of the classes should be the result of calling <code>HvENAME()</code> on the stash. In those cases where <code>HvENAME()</code> returns null, <code>HvNAME()</code> should be used instead.</p> <p>The caller is responsible for incrementing the reference count of the array returned if it wants to keep the structure. Hence, if you have created a temporary value that you keep no pointer to, <code>sv_2mortal()</code> to ensure that it is disposed of correctly. If you have cached your return value, then return a pointer to it without changing the reference count.</p> <h1 id="Caching"><a class="permalink" href="#Caching">#</a>Caching</h1> <p>Computing MROs can be expensive. The implementation provides a cache, in which you can store a single <code>SV *</code>, or anything that can be cast to <code>SV *</code>, such as <code>AV *</code>. To read your private value, use the macro <code>MRO_GET_PRIVATE_DATA()</code>, passing it the <code>mro_meta</code> structure from the stash, and a pointer to your <code>mro_alg</code> structure:</p> <pre><code>meta = HvMROMETA(stash); private_sv = MRO_GET_PRIVATE_DATA(meta, &my_mro_alg);</code></pre> <p>To set your private value, call <code>Perl_mro_set_private_data()</code>:</p> <pre><code>Perl_mro_set_private_data(aTHX_ meta, &c3_alg, private_sv);</code></pre> <p>The private data cache will take ownership of a reference to private_sv, much the same way that <code>hv_store()</code> takes ownership of a reference to the value that you pass it.</p> <h1 id="Examples"><a class="permalink" href="#Examples">#</a>Examples</h1> <p>For examples of MRO implementations, see <code>S_mro_get_linear_isa_c3()</code> and the <code>BOOT:</code> section of <i>mro/mro.xs</i>, and <code>S_mro_get_linear_isa_dfs()</code> in <i>mro.c</i></p> <h1 id="AUTHORS"><a class="permalink" href="#AUTHORS">#</a>AUTHORS</h1> <p>The implementation of the C3 MRO and switchable MROs within the perl core was written by Brandon L Black. Nicholas Clark created the pluggable interface, refactored Brandon's implementation to work with it, and wrote this document.</p> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). Please contact him via the <a href="https://github.com/Grinnz/perldoc-browser/issues">GitHub issue tracker</a> or <a href="mailto:dbook@cpan.org">email</a> regarding any issues with the site itself, search, or rendering of documentation.</p> <p>The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. 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