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README.md

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+# arena.h
+
+A single header library that implements
+[https://en.wikipedia.org/wiki/Region-based_memory_management](region-based memory management) in C.
+
+## Example
+
+```c
+#define ARENA_IMPLEMENTATION
+#include "arena.h"
+
+int main(void)
+{
+    Arena a = {0};
+
+    int *x = arena_alloc(&a, sizeof(*x) * 69);
+    float *y = arena_alloc(&a, sizeof(*y) * 420);
+
+    arena_free(&a);
+    return 0;
+}
+```