# Template Metaprogramming

In this lesson, we'll learn about template metaprogramming.

## Template Metaprogramming

### How this all started:

- 1994 Erwin Unruh discovered template metaprogramming by accident.
- His program failed to compile but calculated the first 30 prime numbers at compile-time.
- To prove his point, he used the error messages to display the first 30 prime numbers.

Let’s have a look at the screenshot of the error:

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