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SettableStruct.html
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SettableStruct.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
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<title>
Module: Concurrent::SettableStruct
— Concurrent Ruby
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<div id="content"><h1>Module: Concurrent::SettableStruct
</h1>
<div class="box_info">
<dl>
<dt>Defined in:</dt>
<dd>lib/concurrent/settable_struct.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>An thread-safe, write-once variation of Ruby's standard <code>Struct</code>.
Each member can have its value set at most once, either at construction
or any time thereafter. Attempting to assign a value to a member
that has already been set will result in a <code>Concurrent::ImmutabilityError</code>.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">See Also:</p>
<ul class="see">
<li><a href="http://ruby-doc.org/core-2.2.0/Struct.html" target="_parent" title="Ruby standard library `Struct`">Ruby standard library `Struct`</a></li>
<li><a href="http://en.wikipedia.org/wiki/Final_(Java)" target="_parent" title="Java `final` keyword">Java `final` keyword</a></li>
</ul>
</div>
<h2>
Class Method Summary
<small><a href="#" class="summary_toggle">collapse</a></small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#new-class_method" title="new (class method)">.<strong>new</strong>(*args, &block) ⇒ undocumented </a>
</span>
<span class="summary_desc"><div class='inline'><p>Factory for creating new struct classes.</p>
</div></span>
</li>
</ul>
<h2>
Instance Method Summary
<small><a href="#" class="summary_toggle">collapse</a></small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#==-instance_method" title="#== (instance method)">#<strong>==</strong>(other) ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Equality.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#[]-instance_method" title="#[] (instance method)">#<strong>[]</strong>(member) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Attribute Reference.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#[]=-instance_method" title="#[]= (instance method)">#<strong>[]=</strong>(member, value) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Attribute Assignment.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#each-instance_method" title="#each (instance method)">#<strong>each</strong> {|value| ... } ⇒ undocumented </a>
</span>
<span class="summary_desc"><div class='inline'><p>Yields the value of each struct member in order.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#each_pair-instance_method" title="#each_pair (instance method)">#<strong>each_pair</strong> {|member, value| ... } ⇒ undocumented </a>
</span>
<span class="summary_desc"><div class='inline'><p>Yields the name and value of each struct member in order.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#inspect-instance_method" title="#inspect (instance method)">#<strong>inspect</strong> ⇒ String </a>
(also: #to_s)
</span>
<span class="summary_desc"><div class='inline'><p>Describe the contents of this struct in a string.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#merge-instance_method" title="#merge (instance method)">#<strong>merge</strong>(other) {|member, selfvalue, othervalue| ... } ⇒ Synchronization::AbstractStruct </a>
</span>
<span class="summary_desc"><div class='inline'><p>Returns a new struct containing the contents of <code>other</code> and the contents of <code>self</code>.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#select-instance_method" title="#select (instance method)">#<strong>select</strong> {|value| ... } ⇒ Array </a>
</span>
<span class="summary_desc"><div class='inline'><p>Yields each member value from the struct to the block and returns an Array containing the member values from the struct for which the given block returns a true value (equivalent to <code>Enumerable#select</code>).</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#to_h-instance_method" title="#to_h (instance method)">#<strong>to_h</strong> ⇒ Hash </a>
</span>
<span class="summary_desc"><div class='inline'><p>Returns a hash containing the names and values for the struct’s members.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#values-instance_method" title="#values (instance method)">#<strong>values</strong> ⇒ Array </a>
(also: #to_a)
</span>
<span class="summary_desc"><div class='inline'><p>Returns the values for this struct as an Array.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#values_at-instance_method" title="#values_at (instance method)">#<strong>values_at</strong>(*indexes) ⇒ undocumented </a>
</span>
<span class="summary_desc"><div class='inline'><p>Returns the struct member values for each selector as an Array.</p>
</div></span>
</li>
</ul>
<div id="class_method_details" class="method_details_list">
<h2>Class Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="new-class_method">
.<strong>new</strong>(*args, &block) ⇒ <tt>undocumented</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Factory for creating new struct classes.</p>
<pre class="code ruby"><code class="ruby">new([class_name] [, member_name]+>) -> StructClass click to toggle source
new([class_name] [, member_name]+>) {|StructClass| block } -> StructClass
new(value, ...) -> obj
StructClass[value, ...] -> obj
</code></pre>
<p>The first two forms are used to create a new struct subclass <code>class_name</code>
that can contain a value for each member_name . This subclass can be
used to create instances of the structure like any other Class .</p>
<p>If the <code>class_name</code> is omitted an anonymous struct class will be created.
Otherwise, the name of this struct will appear as a constant in the struct class,
so it must be unique for all structs under this base class and must start with a
capital letter. Assigning a struct class to a constant also gives the class
the name of the constant.</p>
<p>If a block is given it will be evaluated in the context of <code>StructClass</code>, passing
the created class as a parameter. This is the recommended way to customize a struct.
Subclassing an anonymous struct creates an extra anonymous class that will never be used.</p>
<p>The last two forms create a new instance of a struct subclass. The number of value
parameters must be less than or equal to the number of attributes defined for the
struct. Unset parameters default to nil. Passing more parameters than number of attributes
will raise an <code>ArgumentError</code>.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">See Also:</p>
<ul class="see">
<li><a href="http://ruby-doc.org/core-2.2.0/Struct.html#method-c-new" target="_parent" title="Ruby standard library `Struct#new`">Ruby standard library `Struct#new`</a></li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
95
96
97
98
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101
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103</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/settable_struct.rb', line 95</span>
<span class='kw'>def</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='op'>*</span><span class='id identifier rubyid_args'>args</span><span class='comma'>,</span> <span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span>
<span class='id identifier rubyid_clazz_name'>clazz_name</span> <span class='op'>=</span> <span class='kw'>nil</span>
<span class='kw'>if</span> <span class='id identifier rubyid_args'>args</span><span class='period'>.</span><span class='id identifier rubyid_length'>length</span> <span class='op'>==</span> <span class='int'>0</span>
<span class='id identifier rubyid_raise'>raise</span> <span class='const'>ArgumentError</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>wrong number of arguments (0 for 1+)</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
<span class='kw'>elsif</span> <span class='id identifier rubyid_args'>args</span><span class='period'>.</span><span class='id identifier rubyid_length'>length</span> <span class='op'>></span> <span class='int'>0</span> <span class='op'>&&</span> <span class='id identifier rubyid_args'>args</span><span class='period'>.</span><span class='id identifier rubyid_first'>first</span><span class='period'>.</span><span class='id identifier rubyid_is_a?'>is_a?</span><span class='lparen'>(</span><span class='const'>String</span><span class='rparen'>)</span>
<span class='id identifier rubyid_clazz_name'>clazz_name</span> <span class='op'>=</span> <span class='id identifier rubyid_args'>args</span><span class='period'>.</span><span class='id identifier rubyid_shift'>shift</span>
<span class='kw'>end</span>
<span class='const'>FACTORY</span><span class='period'>.</span><span class='id identifier rubyid_define_struct'>define_struct</span><span class='lparen'>(</span><span class='id identifier rubyid_clazz_name'>clazz_name</span><span class='comma'>,</span> <span class='id identifier rubyid_args'>args</span><span class='comma'>,</span> <span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
</div>
<div id="instance_method_details" class="method_details_list">
<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="==-instance_method">
#<strong>==</strong>(other) ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Equality</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if other has the same struct subclass and has
equal member values (according to <code>Object#==</code>)</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
50
51
52</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/settable_struct.rb', line 50</span>
<span class='kw'>def</span> <span class='op'>==</span><span class='lparen'>(</span><span class='id identifier rubyid_other'>other</span><span class='rparen'>)</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_equality'>ns_equality</span><span class='lparen'>(</span><span class='id identifier rubyid_other'>other</span><span class='rparen'>)</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="[]-instance_method">
#<strong>[]</strong>(member) ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Attribute Reference</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>member</span>
<span class='type'>(<tt>Symbol</tt>, <tt>String</tt>, <tt>Integer</tt>)</span>
—
<div class='inline'><p>the string or symbol name of the member
for which to obtain the value or the member's index</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the value of the given struct member or the member at the given index.</p>
</div>
</li>
</ul>
<p class="tag_title">Raises:</p>
<ul class="raise">
<li>
<span class='type'>(<tt>NameError</tt>)</span>
—
<div class='inline'><p>if the member does not exist</p>
</div>
</li>
<li>
<span class='type'>(<tt>IndexError</tt>)</span>
—
<div class='inline'><p>if the index is out of range.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
45
46
47</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/settable_struct.rb', line 45</span>
<span class='kw'>def</span> <span class='op'>[]</span><span class='lparen'>(</span><span class='id identifier rubyid_member'>member</span><span class='rparen'>)</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_get'>ns_get</span><span class='lparen'>(</span><span class='id identifier rubyid_member'>member</span><span class='rparen'>)</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
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<div class="method_details ">
<h3 class="signature " id="[]=-instance_method">
#<strong>[]=</strong>(member, value) ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Attribute Assignment</p>
<p>Sets the value of the given struct member or the member at the given index.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>member</span>
<span class='type'>(<tt>Symbol</tt>, <tt>String</tt>, <tt>Integer</tt>)</span>
—
<div class='inline'><p>the string or symbol name of the member
for which to obtain the value or the member's index</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the value of the given struct member or the member at the given index.</p>
</div>
</li>
</ul>
<p class="tag_title">Raises:</p>
<ul class="raise">
<li>
<span class='type'>(<tt>NameError</tt>)</span>
—
<div class='inline'><p>if the name does not exist</p>
</div>
</li>
<li>
<span class='type'>(<tt>IndexError</tt>)</span>
—
<div class='inline'><p>if the index is out of range.</p>
</div>
</li>
<li>
<span class='type'>(<tt><span class='object_link'><a href="../Concurrent.html#ImmutabilityError-constant" title="Concurrent::ImmutabilityError (constant)">Concurrent::ImmutabilityError</a></span></tt>)</span>
—
<div class='inline'><p>if the given member has already been set</p>
</div>
</li>
</ul>
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<pre class="code"><span class="info file"># File 'lib/concurrent/settable_struct.rb', line 75</span>
<span class='kw'>def</span> <span class='op'>[]=</span><span class='lparen'>(</span><span class='id identifier rubyid_member'>member</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span><span class='rparen'>)</span>
<span class='kw'>if</span> <span class='id identifier rubyid_member'>member</span><span class='period'>.</span><span class='id identifier rubyid_is_a?'>is_a?</span> <span class='const'>Integer</span>
<span class='id identifier rubyid_length'>length</span> <span class='op'>=</span> <span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='ivar'>@values</span><span class='period'>.</span><span class='id identifier rubyid_length'>length</span> <span class='rbrace'>}</span>
<span class='kw'>if</span> <span class='id identifier rubyid_member'>member</span> <span class='op'>>=</span> <span class='id identifier rubyid_length'>length</span>
<span class='id identifier rubyid_raise'>raise</span> <span class='const'>IndexError</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>offset </span><span class='embexpr_beg'>#{</span><span class='id identifier rubyid_member'>member</span><span class='embexpr_end'>}</span><span class='tstring_content'> too large for struct(size:</span><span class='embexpr_beg'>#{</span><span class='id identifier rubyid_length'>length</span><span class='embexpr_end'>}</span><span class='tstring_content'>)</span><span class='tstring_end'>"</span></span><span class='rparen'>)</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>unless</span> <span class='ivar'>@values</span><span class='lbracket'>[</span><span class='id identifier rubyid_member'>member</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_nil?'>nil?</span>
<span class='id identifier rubyid_raise'>raise</span> <span class='const'><span class='object_link'><a href="../Concurrent.html" title="Concurrent (module)">Concurrent</a></span></span><span class='op'>::</span><span class='const'><span class='object_link'><a href="../Concurrent.html#ImmutabilityError-constant" title="Concurrent::ImmutabilityError (constant)">ImmutabilityError</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>struct member has already been set</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
<span class='kw'>end</span>
<span class='ivar'>@values</span><span class='lbracket'>[</span><span class='id identifier rubyid_member'>member</span><span class='rbracket'>]</span> <span class='op'>=</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span>
<span class='kw'>else</span>
<span class='id identifier rubyid_send'>send</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='embexpr_beg'>#{</span><span class='id identifier rubyid_member'>member</span><span class='embexpr_end'>}</span><span class='tstring_content'>=</span><span class='tstring_end'>"</span></span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span><span class='rparen'>)</span>
<span class='kw'>end</span>
<span class='kw'>rescue</span> <span class='const'>NoMethodError</span>
<span class='id identifier rubyid_raise'>raise</span> <span class='const'>NameError</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>no member '</span><span class='embexpr_beg'>#{</span><span class='id identifier rubyid_member'>member</span><span class='embexpr_end'>}</span><span class='tstring_content'>' in struct</span><span class='tstring_end'>"</span></span><span class='rparen'>)</span>
<span class='kw'>end</span></pre>
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<div class="method_details ">
<h3 class="signature " id="each-instance_method">
#<strong>each</strong> {|value| ... } ⇒ <tt>undocumented</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Yields the value of each struct member in order. If no block is given
an enumerator is returned.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'></span>
<div class='inline'><p>the operation to be performed on each struct member</p>
</div>
</li>
</ul>
<p class="tag_title">Yield Parameters:</p>
<ul class="yieldparam">
<li>
<span class='name'>value</span>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>each struct value (in order)</p>
</div>
</li>
</ul>
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<pre class="code"><span class="info file"># File 'lib/concurrent/settable_struct.rb', line 55</span>
<span class='kw'>def</span> <span class='id identifier rubyid_each'>each</span><span class='lparen'>(</span><span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span>
<span class='kw'>return</span> <span class='id identifier rubyid_enum_for'>enum_for</span><span class='lparen'>(</span><span class='symbol'>:each</span><span class='rparen'>)</span> <span class='kw'>unless</span> <span class='id identifier rubyid_block_given?'>block_given?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_each'>ns_each</span><span class='lparen'>(</span><span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
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</div>
<div class="method_details ">
<h3 class="signature " id="each_pair-instance_method">
#<strong>each_pair</strong> {|member, value| ... } ⇒ <tt>undocumented</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Yields the name and value of each struct member in order. If no block is
given an enumerator is returned.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'></span>
<div class='inline'><p>the operation to be performed on each struct member/value pair</p>
</div>
</li>
</ul>
<p class="tag_title">Yield Parameters:</p>
<ul class="yieldparam">
<li>
<span class='name'>member</span>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>each struct member (in order)</p>
</div>
</li>
<li>
<span class='name'>value</span>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>each struct value (in order)</p>
</div>
</li>
</ul>
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<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/settable_struct.rb', line 61</span>
<span class='kw'>def</span> <span class='id identifier rubyid_each_pair'>each_pair</span><span class='lparen'>(</span><span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span>
<span class='kw'>return</span> <span class='id identifier rubyid_enum_for'>enum_for</span><span class='lparen'>(</span><span class='symbol'>:each_pair</span><span class='rparen'>)</span> <span class='kw'>unless</span> <span class='id identifier rubyid_block_given?'>block_given?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_each_pair'>ns_each_pair</span><span class='lparen'>(</span><span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
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