Unity3d C # Object Pool Introduction __c#

what is an object pool?

When we instantiate some objects over and over again, although we will use a prefab, the efficiency of a large number of instantiated objects is the bottom. This is where the object pool is used.
object pool, which is used to maintain the structure of an object, called a pool. When you need an object, get an object from the pool instead of instantiating a new object, and then destroy the object from the pool when you no longer need it. The essence of the object pool is that it allows us to get an original object (the object's properties are primitive), regardless of whether the object is new or already in the loop.

simple implementation of object pool pattern

<code class= "HLJS cs has-numbering" style= "Display:block"; padding:0px; Color:inherit; Box-sizing:border-box; font-family: ' Source Code Pro ', monospace;font-size:undefined; White-space:pre; border-radius:0px; Word-wrap:normal; background:transparent; " ><span class= "Hljs-keyword" style= "Color:rgb" (0, 0, 136); Box-sizing:border-box; " >public</span> <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; " >class</span> pool<t> <span class= "Hljs-keyword" style= "Color:rgb" (0, 0, 136); Box-sizing:border-box; " >where</span> T: <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; " >class</span&gt, <span class= "Hljs-title" style= "Box-sizing:border-box"; >new</span> () {<span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); box-sizing:border-box;" >private</span> stack<t> m_stack = <span class= "Hljs-keyword" style= "Color:rgb" (0, 0, 136); Box-sIzing:border-box; "

>new</span> stack<t> (); <span class= "hljs-comment" style= "Color:rgb" (136, 0, 0); Box-sizing:border-box; " >//Get objects </span> <span class= "Hljs-keyword" style= "Color:rgb" (0, 0, 136); Box-sizing:border-box; " >public</span> T <span class= "Hljs-title" style= "Box-sizing:border-box;" >GetNew</span> () {<span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box ;" >if</span> (m_stack. Count = = <span class= "Hljs-number" style= "Color:rgb (0, 102, 102); Box-sizing:border-box; " >0</span>) <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; " >return</span> <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; "
        >new</span> T (); <span class= "Hljs-keyword" style= "Color:rgb" (0, 0, 136); Box-sizing:border-box; " >else</span> <span class= "Hljs-keyword" style= "ColoR:rgb (0, 0, 136); Box-sizing:border-box; " >return</span> M_stack.
    Pop (); } <span class= "Hljs-comment" style= "Color:rgb (136, 0, 0); Box-sizing:border-box; " >//Storage Objects </span> <span class= "Hljs-keyword" style= "Color:rgb" (0, 0, 136); Box-sizing:border-box; " >public</span> <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; " >void</span> <span class= "Hljs-title" style= "Box-sizing:border-box;" >SetPush</span> (t) {m_stack.
    Push (t); }}</code><ul class= "pre-numbering" style= "Box-sizing:border-box; Position:absolute; width:50px; top:0px; left:0px; margin:0px; padding:6px 0px 40px; border-right-width:1px; Border-right-style:solid; Border-right-color:rgb (221, 221, 221); List-style:none; Text-align:right; Background-color:rgb (238, 238, 238); ><li style= "Box-sizing:border-box; padding:0px 5px; " >1</li><li style= "Box-sizing:border-box; padding:0px 5px; " >2</li><li style= "Box-sizing:border-box; padding:0px 5px; " >3</li><li style= "Box-sizing:border-box; padding:0px 5px; " >4</li><li style= "Box-sizing:border-box; padding:0px 5px; " >5</li><li style= "Box-sizing:border-box; padding:0px 5px; " >6</li><li style= "Box-sizing:border-box; padding:0px 5px; " >7</li><li style= "Box-sizing:border-box; padding:0px 5px; " >8</li><li style= "Box-sizing:border-box; padding:0px 5px; " >9</li><li style= "Box-sizing:border-box; padding:0px 5px; " >10</li><li style= "Box-sizing:border-box; padding:0px 5px; " >11</li><li style= "Box-sizing:border-box; padding:0px 5px; " >12</li><li style= "Box-sizing:border-box; padding:0px 5px; " >13</li><li style= "Box-sizing:border-box; padding:0px 5px; " >14</li><li style= "Box-sizing:border-box; padding:0px 5px; " >15</li><li style= "Box-sizing:border-box; Padding:0px 5px; " >16</li><li style= "Box-sizing:border-box; padding:0px 5px; " >17</li><li style= "Box-sizing:border-box; padding:0px 5px; " >18</li></ul><ul class= "pre-numbering" style= "Box-sizing:border-box; Position:absolute; width:50px; top:0px; left:0px; margin:0px; padding:6px 0px 40px; border-right-width:1px; Border-right-style:solid; Border-right-color:rgb (221, 221, 221); List-style:none; Text-align:right; Background-color:rgb (238, 238, 238); ><li style= "Box-sizing:border-box; padding:0px 5px; " >1</li><li style= "Box-sizing:border-box; padding:0px 5px; " >2</li><li style= "Box-sizing:border-box; padding:0px 5px; " >3</li><li style= "Box-sizing:border-box; padding:0px 5px; " >4</li><li style= "Box-sizing:border-box; padding:0px 5px; " >5</li><li style= "Box-sizing:border-box; padding:0px 5px; " >6</li><li style= "Box-sizing:border-box; padding:0px 5px; ">7</li><li style= "Box-sizing:border-box; padding:0px 5px; " >8</li><li style= "Box-sizing:border-box; padding:0px 5px; " >9</li><li style= "Box-sizing:border-box; padding:0px 5px; " >10</li><li style= "Box-sizing:border-box; padding:0px 5px; " >11</li><li style= "Box-sizing:border-box; padding:0px 5px; " >12</li><li style= "Box-sizing:border-box; padding:0px 5px; " >13</li><li style= "Box-sizing:border-box; padding:0px 5px; " >14</li><li style= "Box-sizing:border-box; padding:0px 5px; " >15</li><li style= "Box-sizing:border-box; padding:0px 5px; " >16</li><li style= "Box-sizing:border-box; padding:0px 5px; " >17</li><li style= "Box-sizing:border-box; padding:0px 5px; " >18</li></ul>

This object pool, though small, viscera is also not taste. Let's look at how to use  
in a script, a new object is usually like this

<code class= "Hljs vbnet has-numbering" style= "Display:block"; padding:0px; Color:inherit; Box-sizing:border-box; font-family: ' Source Code Pro ', monospace;font-size:undefined; White-space:pre; border-radius:0px; Word-wrap:normal; background:transparent; " ><span class= "Hljs-keyword" style= "Color:rgb" (0, 0, 136); Box-sizing:border-box; " >MyClass</span> mc = <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; " >new</span> <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; " >MyClass</span> (); </code><ul class= "pre-numbering" style= "Box-sizing:border-box; Position:absolute; width:50px; top:0px; left:0px; margin:0px; padding:6px 0px 40px; border-right-width:1px; Border-right-style:solid; Border-right-color:rgb (221, 221, 221); List-style:none; Text-align:right; Background-color:rgb (238, 238, 238); ><li style= "Box-sizing:border-box; padding:0px 5px; " >1</li></ul><ul class= "pre-numbering" style= "Box-sizing:border-box; Position:absolute; width:50px; top:0px; left:0px; margin:0px; padding:6px 0px 40px; border-right-width:1px; Border-right-style:solid; Border-right-color:rgb (221, 221, 221); List-style:none; Text-align:right; Background-color:rgb (238, 238, 238); ><li style= "Box-sizing:border-box; padding:0px 5px; " >1</li></ul>

This should be the case with object pooling

<code class= "Hljs r has-numbering" style= "Display:block"; padding:0px; Color:inherit; Box-sizing:border-box; font-family: ' Source Code Pro ', monospace;font-size:undefined; White-space:pre; border-radius:0px; Word-wrap:normal; background:transparent; "

>Pool<MyClass> Poolmyclass = new pool<myclass> ();

    void Update () {MyClass MC = poolmyclass.getnew (); Add various attributes to the MC <span class= "Hljs-keyword" style= "Color:rgb (0, 0, 136); Box-sizing:border-box; "
>...</span> Poolmyclass.setpush (MC); }</code><ul class= "pre-numbering" style= "Box-sizing:border-box; Position:absolute; width:50px; top:0px; left:0px; margin:0px; padding:6px 0px 40px; border-right-width:1px; Border-right-style:solid; Border-right-color:rgb (221, 221, 221); List-style:none; Text-align:right; Background-color:rgb (238, 238, 238); ><li style= "Box-sizing:border-box; padding:0px 5px; " >1</li><li style= "Box-sizing:border-box; padding:0px 5px; " >2</li><li style= "Box-sizing:border-box; padding:0px 5px; " >3</li><li style= "Box-sizing:border-box; padding:0px 5px; " >4</li><li style= "Box-sizing:border-box; padding:0px 5px; " >5</li><li style= "Box-sizing:border-box; padding:0px 5px; " >6</li><li style= "Box-sizing:border-box; padding:0px 5px; " >7</li><li style= "Box-sizing:border-box; padding:0px 5px; " >8</li><li style= "Box-sizing:border-box; padding:0px 5px; " >9</li><li style= "Box-sizing:border-box; padding:0px 5px; " >10</li></ul><ul class= "pre-numbering" style= "Box-sizing:border-box; Position:absolute; width:50px; top:0px; left:0px; margin:0px; padding:6px 0px 40px; border-right-width:1px; Border-right-style:solid; Border-right-color:rgb (221, 221, 221); List-style:none; Text-align:right; Background-color:rgb (238, 238, 238); ><li style= "Box-sizing:border-box; padding:0px 5px; " >1</li><liStyle= "Box-sizing:border-box; padding:0px 5px; " >2</li><li style= "Box-sizing:border-box; padding:0px 5px; " >3</li><li style= "Box-sizing:border-box; padding:0px 5px; " >4</li><li style= "Box-sizing:border-box; padding:0px 5px; " >5</li><li style= "Box-sizing:border-box; padding:0px 5px; " >6</li><li style= "Box-sizing:border-box; padding:0px 5px; " >7</li><li style= "Box-sizing:border-box; padding:0px 5px; " >8</li><li style= "Box-sizing:border-box; padding:0px 5px; " >9</li><li style= "Box-sizing:border-box; padding:0px 5px; " >10</li></ul>

the complete object pool

A full object pool is complex and functions as follows
1, take object operation
2, Save object operation
3, release the object. The unused objects are released.
4, the object is reset, because the last guarantee is that each fetch is pure, the standard
5, the management of resources, an object pool management database management data is very terrible (game objects, databases, external resources, etc.)
6, Thread safe
......