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<h1 id="vector-implementation-basics">Vector Implementation Basics</h1>
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<ul>
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<li>CMPT 225</li>
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<li>Fall 2021</li>
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<li>Lecture 4</li>
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</ul>
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<h2 id="example-using-a-simple-vector-class">Example Using a Simple “Vector” Class</h2>
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<p>Take a look at the <a href="./simple_vector.cpp">simple_vector.cpp</a> file.</p>
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<table>
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Value</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><span id="y1">y</span></td>
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<td>float</td>
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<td>(empty)</td>
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</tr>
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<tr>
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<td><span id="x1">x</span></td>
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<td>int</td>
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<td>5</td>
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</tr>
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<tr>
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<td>…</td>
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<td>…</td>
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<td>…</td>
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</tr>
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<tr>
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<td>p</td>
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<td>int *</td>
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<td><a href="#x1">address</a></td>
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</tr>
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<tr>
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<td>g</td>
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<td>int *</td>
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<td><a href="#y1">p+1</a></td>
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</tr>
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</tbody>
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</table>
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<p>What is *g?</p>
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<h2 id="implementation-in-ivectorh">Implementation in <em>IVector.h</em></h2>
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<p>See <a href="./IVector.h">IVector.h</a></p>
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<h2 id="templates">Templates</h2>
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<ul>
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<li>Often, we have algorithms that will work on many data types, with few or no changes.</li>
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<li>In <em>strongly typed</em> languages, we need a way to produce “generic” code–code that can work on different types in different places.</li>
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<li>In C++, <em>templates</em> let us write generic code.</li>
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<li>A template function or class defineition has a <em>placeholder</em> for one or more data types that is instanciated at compile time.</li>
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<li>The instanciation may be different at different places in the same code.</li>
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</ul>
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<h2 id="test-program">Test Program</h2>
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<p>See <a href="./test_program.cpp">test_program.cpp</a></p>
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<p>See <a href="./simple_vector2.cpp">simple_vector2.cpp</a></p>
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<h2 id="tvector-is-a-templated-version-of-ivector">TVector is a templated version of IVector</h2>
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<p>See <a href="./TVector.h">TVector.h</a></p>
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<p>See <a href="./Vector.h">Vector.h</a></p>
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<p>See <a href="./TestVector.cpp">TestVector.cpp</a></p>
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