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<div class="section" id="scope-rules-for-functions-and-methods">
<span id="index-0"></span><h1>Scope Rules for Functions and Methods<a class="headerlink" href="#scope-rules-for-functions-and-methods" title="Permalink to this headline">¶</a></h1>
<p>In this chapter we will learn about the scope rules for functions and methods.</p>
<p>You need to know the next information once you started using Ring for large applications.</p>
<p>These applications may contains and use</p>
<ul class="simple">
<li><p>Many Packages and Classes written in Ring</p></li>
<li><p>Many Functions written in Ring</p></li>
<li><p>Standard Ring Functions (Written in C language)</p></li>
<li><p>Functions and Classes written in C/C++ languages</p></li>
</ul>
<div class="section" id="how-ring-find-the-functions-and-methods">
<span id="index-1"></span><h2>How Ring find the Functions and Methods?<a class="headerlink" href="#how-ring-find-the-functions-and-methods" title="Permalink to this headline">¶</a></h2>
<p>When you call a method or function, Ring will start a search process to find this function</p>
<p>If found –> Call the function and store the function pointer in the cache so Ring can use it again with doing another search.</p>
<p>If not found —> Runtime error message (That you can avoid using Try/Catch)</p>
<p>How the search process is done?</p>
<p>Search for functions/methods follow the next order</p>
<p>1 - Search in methods (if we are inside class method or object using braces {})</p>
<p>2 - Search in functions written by the programmer using Ring Code</p>
<p>3 - Search in functions written in C/C++ like standard Ring functions</p>
<p>This enable us to write clean code inside classes methods and avoid any conflict with functions.</p>
<p>If we want to call a function with the same name as a method in the class we will need a wrapper function or we will access a temp. object using { } then call that function there.</p>
<p>We can replace C/C++ Functions with Ring Functions.</p>
<p>We can replace Ring Functions with Ring Methods.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Using self.method() is not necessary in any use case.</p>
</div>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>We can use this.method() to escape from the current active scope that we access using braces {} and call a method in the class that we are inside.</p>
</div>
</div>
<div class="section" id="example-about-sharing-names-between-functions-and-methods">
<span id="index-2"></span><h2>Example about Sharing Names between Functions and Methods<a class="headerlink" href="#example-about-sharing-names-between-functions-and-methods" title="Permalink to this headline">¶</a></h2>
<p>Look at the next example</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">func</span> <span class="n">main</span>
<span class="n">o1</span> <span class="o">=</span> <span class="k">new</span> <span class="n">myclass</span> <span class="p">{</span> <span class="n">test</span><span class="p">()</span> <span class="n">test2</span><span class="p">()</span> <span class="p">}</span>
<span class="n">test2</span><span class="p">()</span>
<span class="k">func</span> <span class="n">f1</span>
<span class="k">see</span> <span class="s">"f1 function"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">f2</span>
<span class="k">see</span> <span class="s">"f2 function"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">f3</span>
<span class="k">see</span> <span class="s">"f3 function"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">test2</span>
<span class="n">myline</span><span class="p">()</span>
<span class="k">see</span> <span class="s">"test2 function"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">new</span> <span class="n">myclass</span> <span class="p">{</span>
<span class="n">f1</span><span class="p">()</span>
<span class="n">f2</span><span class="p">()</span>
<span class="n">f3</span><span class="p">()</span>
<span class="n">self</span><span class="p">.</span><span class="n">f3</span><span class="p">()</span>
<span class="p">}</span>
<span class="n">myobj</span> <span class="o">=</span> <span class="k">new</span> <span class="n">myclass</span>
<span class="n">myobj</span><span class="p">.</span><span class="n">f3</span><span class="p">()</span>
<span class="n">myline</span><span class="p">()</span>
<span class="k">func</span> <span class="n">myline</span>
<span class="k">see</span> <span class="n">copy</span><span class="p">(</span><span class="s">"="</span><span class="p">,</span><span class="mi">40</span><span class="p">)</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">Class</span> <span class="n">myclass</span>
<span class="k">func</span> <span class="n">test</span>
<span class="n">myline</span><span class="p">()</span>
<span class="k">see</span> <span class="s">"test method"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="n">f1</span><span class="p">()</span>
<span class="n">f2</span><span class="p">()</span>
<span class="n">f3</span><span class="p">()</span>
<span class="n">myline</span><span class="p">()</span>
<span class="k">func</span> <span class="n">f3</span>
<span class="k">see</span> <span class="s">"f3 method"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">test2</span>
<span class="n">myline</span><span class="p">()</span>
<span class="k">see</span> <span class="s">"test2 method"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="n">self</span> <span class="p">{</span>
<span class="n">f1</span><span class="p">()</span>
<span class="n">f2</span><span class="p">()</span>
<span class="n">f3</span><span class="p">()</span>
<span class="p">}</span>
<span class="n">myline</span><span class="p">()</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>========================================
test method
f1 function
f2 function
f3 method
========================================
========================================
test2 method
f1 function
f2 function
f3 method
========================================
========================================
test2 function
f1 function
f2 function
f3 method
f3 method
f3 method
========================================
</pre></div>
</div>
</div>
<div class="section" id="calling-a-function-sharing-the-name-with-a-method-in-the-current-class">
<span id="index-3"></span><h2>Calling a function sharing the name with a method in the current class<a class="headerlink" href="#calling-a-function-sharing-the-name-with-a-method-in-the-current-class" title="Permalink to this headline">¶</a></h2>
<p>In the previous example we have a function called f3() and we have a method called f3()</p>
<p>How we can call the f3() function from the test() method ?</p>
<p>Solution (1) : Change the current object scope to another object scope</p>
<p>In this solution we will have an empty class called local that we will use to change the current object scope.</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">func</span> <span class="n">main</span>
<span class="n">o1</span> <span class="o">=</span> <span class="k">new</span> <span class="n">myclass</span> <span class="p">{</span> <span class="n">test</span><span class="p">()}</span>
<span class="k">func</span> <span class="n">f1</span>
<span class="k">see</span> <span class="s">"f1 function"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">f2</span>
<span class="k">see</span> <span class="s">"f2 function"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">f3</span>
<span class="k">see</span> <span class="s">"f3 function"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">func</span> <span class="n">myline</span>
<span class="k">see</span> <span class="n">copy</span><span class="p">(</span><span class="s">"="</span><span class="p">,</span><span class="mi">40</span><span class="p">)</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">Class</span> <span class="n">myclass</span>
<span class="k">func</span> <span class="n">test</span>
<span class="n">myline</span><span class="p">()</span>
<span class="k">see</span> <span class="s">"test method"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="n">f1</span><span class="p">()</span>
<span class="n">f2</span><span class="p">()</span>
<span class="n">f3</span><span class="p">()</span> <span class="c"># call f3() method</span>
<span class="k">new</span> <span class="n">local</span> <span class="p">{</span> <span class="n">f3</span><span class="p">()</span> <span class="p">}</span> <span class="c"># call f3() function</span>
<span class="n">myline</span><span class="p">()</span>
<span class="k">func</span> <span class="n">f3</span>
<span class="k">see</span> <span class="s">"f3 method"</span> <span class="o">+</span> <span class="n">nl</span>
<span class="k">class</span> <span class="n">local</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>========================================
test method
f1 function
f2 function
f3 method
f3 function
========================================
</pre></div>
</div>
</div>
</div>
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