https://github.com/daquexian/coroutine_error_handling

https://github.com/daquexian/coroutine_error_handling

Last synced: 16 days ago
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• Host: GitHub
• URL: https://github.com/daquexian/coroutine_error_handling
• Owner: daquexian
• Created: 2020-03-23T03:18:00.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-03-23T03:19:29.000Z (over 4 years ago)
• Last Synced: 2024-10-07T09:02:49.778Z (about 1 month ago)
• Language: C++
• Size: 13.7 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Coroutine as Error Handling

Either monad by coroutine introduced in C++20 based on [tl::expected](https://github.com/TartanLlama/expected) and [coroutine_monad](https://github.com/toby-allsopp/coroutine_monad)

Example:

```cpp

expected dividem(float a, float b) {

  if (b == 0) {

    return make_unexpected("Dividend in dividem is 0");

  }

  return a / b;

}

expected sqrtm(float a) {

  if (a < 0) {

    return make_unexpected("Radicand in sqrtm < 0");

  }

  return sqrt(a);

}

expected sqrt_of_quotient(float a, float b) {

  float c = trym dividem(a, b);

  float d = trym sqrtm(c);

  retm d;

}

int main() {

  std::cout << sqrt_of_quotient(32, 2) << std::endl;   // Result: 4

  std::cout << sqrt_of_quotient(10, -1) << std::endl;  // Error: Radicand in sqrtm < 0

  std::cout << sqrt_of_quotient(-8, -2) << std::endl;  // Error: Dividend in dividem is 0

  return 0;

}

```

Reference: 

https://github.com/toby-allsopp/coroutine_monad

https://github.com/TartanLlama/expected