https://github.com/cihansari/flexinvokable

Single header container for lambdas with (or without) move-only encapsulation that can be invoked only once.
https://github.com/cihansari/flexinvokable

cpp cpp17 cpp1z

Last synced: about 10 hours ago
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Single header container for lambdas with (or without) move-only encapsulation that can be invoked only once.

• Host: GitHub
• URL: https://github.com/cihansari/flexinvokable
• Owner: CihanSari
• License: mit
• Created: 2018-04-13T08:22:10.000Z (over 6 years ago)
• Default Branch: main
• Last Pushed: 2021-11-10T08:52:12.000Z (almost 3 years ago)
• Last Synced: 2024-09-24T21:04:14.269Z (about 15 hours ago)
• Topics: cpp, cpp17, cpp1z
• Language: C++
• Homepage:
• Size: 133 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: LICENSE

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README

        
# Flexible invokable for C++17

Single header container for lambdas with (or without) move-only encapsulation that can be invoked only once.

The topic of this repository is to address the need to store lambdas in containers (such as vectors). The generic way you are expected to do this is in [std::function](https://en.cppreference.com/w/cpp/utility/functional/function). However, `std::function` requires the encapsulated contents to be copy constructable. This is easy to imagine from the above struct: encapsulations sometimes cause issue! If you have members that are not copiable, then you cannot use `std::function` even though contents are movable. This is the need we are trying to address in `flexInvokable`. You can store your lambdas in move-only containers.

[![vah_CI](https://github.com/CihanSari/flexInvokable/actions/workflows/main.yml/badge.svg)](https://github.com/CihanSari/flexInvokable/actions/workflows/main.yml)

[![CodeQL](https://github.com/CihanSari/flexInvokable/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/CihanSari/flexInvokable/actions/workflows/codeql-analysis.yml)

## Example

Example is shown in `test/src/example.cpp`.

## How to use

Add flexInvokable/include/flexInvokable.hpp to your project.

## Source

Originally found as an answer to the request in [stackoverflow](https://stackoverflow.com/questions/25421346/how-to-create-an-stdfunction-from-a-move-capturing-lambda-expression). 

I had to make slight changes from [source demo](http://coliru.stacked-crooked.com/a/1cfdcd0491686fe1) 

```

void(*invoke)(void*, Args...) = nullptr; 

```

to

```

R(*invoke)(void*, Args...) = nullptr; 

```

Moreover, 

```

std::result_of_t&(Args...)>

```

is getting deprecated, and therefore replaced to

```

#if _HAS_CXX17

    std::invoke_result_t

#else

    std::result_of_t&(Args...)>

#endif

```