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311 lines
9.9 KiB
311 lines
9.9 KiB
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<title>comparer - The Go Programming Language</title>
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...
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<div class="top-heading" id="heading-wide"><a href="http://localhost:6060/">The Go Programming Language</a></div>
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<div class="container">
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<h1>Package comparer</h1>
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<div id="nav"></div>
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<!--
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file.
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-->
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<!--
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Note: Static (i.e., not template-generated) href and id
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attributes start with "pkg-" to make it impossible for
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them to conflict with generated attributes (some of which
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correspond to Go identifiers).
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-->
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<script type='text/javascript'>
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document.ANALYSIS_DATA = null;
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document.CALLGRAPH = null;
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</script>
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<div id="short-nav">
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<dl>
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<dd><code>import "github.com/syndtr/goleveldb/leveldb/comparer"</code></dd>
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</dl>
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<dl>
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<dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd>
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<dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Overview section">Overview ▾</h2>
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<p>
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Package comparer provides interface and implementation for ordering
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sets of data.
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</p>
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</div>
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</div>
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<h2 class="toggleButton" title="Click to show Index section">Index ▹</h2>
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<h2 class="toggleButton" title="Click to hide Index section">Index ▾</h2>
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<!-- Table of contents for API; must be named manual-nav to turn off auto nav. -->
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<div id="manual-nav">
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<dl>
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<dd><a href="index.html#pkg-variables">Variables</a></dd>
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<dd><a href="index.html#BasicComparer">type BasicComparer</a></dd>
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<dd><a href="index.html#Comparer">type Comparer</a></dd>
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</dl>
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</div><!-- #manual-nav -->
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<h4>Package files</h4>
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<p>
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<span style="font-size:90%">
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<a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/comparer/bytes_comparer.go">bytes_comparer.go</a>
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<a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/comparer/comparer.go">comparer.go</a>
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</span>
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</p>
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</div><!-- .expanded -->
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</div><!-- #pkg-index -->
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<h2 class="toggleButton" title="Click to show Internal Call Graph section">Internal call graph ▹</h2>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Internal Call Graph section">Internal call graph ▾</h2>
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<p>
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In the call graph viewer below, each node
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is a function belonging to this package
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and its children are the functions it
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calls—perhaps dynamically.
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</p>
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<p>
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The root nodes are the entry points of the
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package: functions that may be called from
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outside the package.
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There may be non-exported or anonymous
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functions among them if they are called
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dynamically from another package.
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</p>
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<p>
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Click a node to visit that function's source code.
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From there you can visit its callers by
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clicking its declaring <code>func</code>
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token.
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</p>
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<p>
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Functions may be omitted if they were
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determined to be unreachable in the
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particular programs or tests that were
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analyzed.
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</p>
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<!-- Zero means show all package entry points. -->
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<ul style="margin-left: 0.5in" id="callgraph-0" class="treeview"></ul>
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</div>
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</div> <!-- #pkg-callgraph -->
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<h2 id="pkg-variables">Variables</h2>
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<pre>var <span id="DefaultComparer">DefaultComparer</span> = bytesComparer{}</pre>
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<p>
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DefaultComparer are default implementation of the Comparer interface.
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It uses the natural ordering, consistent with bytes.Compare.
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</p>
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<h2 id="BasicComparer">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/comparer/comparer.go?s=372:691#L2">BasicComparer</a></h2>
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<pre>type BasicComparer interface {
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<span class="comment">// Compare returns -1, 0, or +1 depending on whether a is 'less than',</span>
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<span class="comment">// 'equal to' or 'greater than' b. The two arguments can only be 'equal'</span>
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<span class="comment">// if their contents are exactly equal. Furthermore, the empty slice</span>
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<span class="comment">// must be 'less than' any non-empty slice.</span>
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Compare(a, b []<a href="../../../../../builtin/index.html#byte">byte</a>) <a href="../../../../../builtin/index.html#int">int</a>
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}</pre>
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<p>
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BasicComparer is the interface that wraps the basic Compare method.
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</p>
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<h2 id="Comparer">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/comparer/comparer.go?s=792:2145#L12">Comparer</a></h2>
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<pre>type Comparer interface {
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<a href="index.html#BasicComparer">BasicComparer</a>
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<span class="comment">// Name returns name of the comparer.</span>
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<span class="comment">//</span>
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<span class="comment">// The Level-DB on-disk format stores the comparer name, and opening a</span>
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<span class="comment">// database with a different comparer from the one it was created with</span>
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<span class="comment">// will result in an error.</span>
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<span class="comment">//</span>
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<span class="comment">// An implementation to a new name whenever the comparer implementation</span>
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<span class="comment">// changes in a way that will cause the relative ordering of any two keys</span>
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<span class="comment">// to change.</span>
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<span class="comment">//</span>
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<span class="comment">// Names starting with "leveldb." are reserved and should not be used</span>
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<span class="comment">// by any users of this package.</span>
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Name() <a href="../../../../../builtin/index.html#string">string</a>
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<span class="comment">// Separator appends a sequence of bytes x to dst such that a <= x && x < b,</span>
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<span class="comment">// where 'less than' is consistent with Compare. An implementation should</span>
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<span class="comment">// return nil if x equal to a.</span>
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<span class="comment">//</span>
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<span class="comment">// Either contents of a or b should not by any means modified. Doing so</span>
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<span class="comment">// may cause corruption on the internal state.</span>
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Separator(dst, a, b []<a href="../../../../../builtin/index.html#byte">byte</a>) []<a href="../../../../../builtin/index.html#byte">byte</a>
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<span class="comment">// Successor appends a sequence of bytes x to dst such that x >= b, where</span>
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<span class="comment">// 'less than' is consistent with Compare. An implementation should return</span>
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<span class="comment">// nil if x equal to b.</span>
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<span class="comment">//</span>
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<span class="comment">// Contents of b should not by any means modified. Doing so may cause</span>
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<span class="comment">// corruption on the internal state.</span>
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Successor(dst, b []<a href="../../../../../builtin/index.html#byte">byte</a>) []<a href="../../../../../builtin/index.html#byte">byte</a>
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}</pre>
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<p>
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Comparer defines a total ordering over the space of []byte keys: a 'less
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than' relationship.
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</p>
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