Brainplus:

A user experience

Braden Ganetsky

CppCon 2024 Lightning Talk

## Goals of this talk * User experience * Innovative API

## Brainplus * Parser combinators * Expression templates in C++20 (empty types) * Fully capable at compile-time * Sounds like a famous language?

Epsilon

tok3n

Brainplus

Single "A"

tok3n

Brainplus

Literal "ABC"

tok3n

Brainplus

Version string

tok3n

Version string

Brainplus

Version string

Brainplus

Modifiers in tok3n

## How many ways can we use `+`? * Unary `+a` * Binary `a + b` * Prefix increment `++a` * Postfix increment `a++` * Anything else? (without `+=`) * `a.operator+()` and `a.operator++()` (stay with me)

## How can we inject template parameters? * `a.operator++<Value>()` * `a.operator++<Type>()` * Overload set, therefore both can exist * `a.operator+<String>()` * Necessary because expression templates

Modifiers in Brainplus

Version string v2

Recursion in tok3n

Recursion in Brainplus

Recursion in Brainplus

Recursion in Brainplus

Version string v3

## Next up * `tok3n` to Brainplus converter * Propose to Boost

Thank you!

Braden Ganetsky

braden@ganets.ky

GitHub @k3DW