Using--Libraries

[Butcher3Years]

Using Libraries in C++ – Cherno-Style (Headers, Linking, Pain & Salvation) 🪓🔥

Branch: using-libraries
From The Cherno's C++ series — the episodes where he loses his mind over include paths, linker errors, static vs dynamic libs, and why build systems are both evil and necessary.

What "Using a Library" Actually Means

A library is just pre-written code you want to reuse (math functions, graphics, networking, JSON parsing, etc.).

To use one, you need to do three things:

1. Tell the compiler where to find the headers (.h/.hpp files) → #include + include paths
2. Tell the linker where to find the compiled code (.lib/.a or .dll/.so) → linking
3. Make sure everything is compatible (C++ version, ABI, debug/release, 32/64-bit)

Cherno:

"90% of beginner frustration in C++ comes from libraries.
It's not the code — it's the build system screwing you."

Step-by-Step – How Cherno Teaches It

1. Header-only libraries (easiest – no linking!)

Examples: GLM (math), stb_image, dear imgui, nlohmann/json

// Just drop the .hpp file in your project
#include "glm/glm.hpp"          // or "nlohmann/json.hpp"

// Use it
glm::vec3 position(1.0f, 2.0f, 3.0f);