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POOptimize small 3d vector struct for performance
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  1. POOptimize small 3d vector struct for performance
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    copied!<p>I am fairly new to C++ and have the following, let's call it, issue. In my computer simulation, I am working quite a lot with vectors. I built myself a small struct that represents a vector, and would like to learn how to make the operations (like for example the <code>normalize()</code> function more efficient. Also, is there any benefit in using C++'s <code>valarray</code>? It seems to have some useful methods pre-implemented. </p> <p>I almost exclusively use the <code>normalize()</code> function and addition/substraction/multiplication of vectors. Since all my vectors have only three elements, I am hesitant of including 3rd party libraries in my project.</p> <p>This is my struct: </p> <pre><code>struct vector_t { int _i, _j, _k; vector_t(int i, int j, int k) { _i = i; _j = j; _k = k; } vector_t() {} inline int getI() { return _i; } inline int getJ() { return _j; } inline int getK() { return _k; } inline void setI(int val) { _i = val; } inline void setJ(int val) { _j = val; } inline void setK(int val) { _k = val; } void normalize() { float length = sqrt(_i*_i + _k*_k + _j*_j); _i /= length; _j /= length; _k /= length; } }; </code></pre> <p>And my questions:</p> <ul> <li>How can I speed up the <code>normalize()</code> function or is this already the most efficient way?</li> <li>What would be a more C++-onic way to implement such a struct/class while keeping memory and computer time usages low?</li> <li>Should I prefer a valarray over my own type?</li> </ul>
 

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