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Smart pointer_application

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Let's look at shared_ptr's applications and problems we are often faced with. There are beautiful examples in data structure such as linked-list and tree. In this post, we will take tree example. Before learning shared_ptr, it is common to use normal pointer to save children node's information. When taking tree structure, we can use shared_ptr instead of normal pointer since every node is usually allocated in heap memory. Advantage, when using shared_ptr, is ofcurse automatic  memory releasing. In existing tree structure, Node class should be deleted from high level(or leaf node). So we create  wrapping class called 'tree' and use postorder algorithm to release memory. However Node class ,used with shared_ptr, doesn't need wrapper one and also dose not need to do anything in destructor. Memory will be released automatically in an ordered way. For example, when node is deleted, deleting shared_ptr also follows. Then, shared_ptr's de...
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opengl : How to install it

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'opengl' is a open source graphic library for showing something nice in your computer. Of course you can use some of engines like Unreal Engine4 or Unity for showing graphics. But it is much better to learn opengl for student who want to study or want to get a scheme of graphics. You can learn and understand 'lighting', 'shadowing', 'shading', '3D geometry', and a lot of other things deeper (but not easier) than just using engine. This is the post for how to install opengl in visual studio. The 'khronos' group offers some of files which can be used to build library for opengl in your computer environment. You can use those file by using 'cmake' software. But there's already files builded for specific environment like '64bit visualstudio 2013'. Here's link you can get files for setting opengl in visual studio https://drive.google.com/file/d/1cMGeEtJSj3EsLywZV0dGABzYixL_9oR9/view?usp=sharing After unzip f...
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