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Collection of C++ containers extracted from LLVM

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# lvc

[![Continuous Integration](https://github.com/BenjaminNavarro/lvc/actions/workflows/ci.yml/badge.svg)](https://github.com/BenjaminNavarro/lvc/actions/workflows/ci.yml)

**lvc** is a set of C++ containers extracted form LLVM for an easier integration in external projects.

To avoid any potential conflit, the `llvm` namespace has been replaced by `lvc`.

# Available containers
 - `lvc::SmallVector`: a `std::vector` like container with an inline small buffer to avoid dynamic allocations when a small number of elements is used.

More containers will be added over time or on request. Feel free to open a PR to add a new one.

# Examples

## SmallVector

```cpp
#include <lvc/SmallVector.h>

// Take any SmallVector of ints no matter its inline buffer size
void addInt(lvc::SmallVectorImpl<int>& vec) {
    vec.push_back(42);
}

int main() {
    // reserve storage for two elements on the stack
    lvc::SmallVector<int, 2> vec;

auto is_inline_buffer_used = [&v] {
        const void* vec_start = &v;
        constexpr auto vec_size = sizeof(v);
        const void* buffer_start = v.data();
        return (buffer_start > vec_start) && (buffer_start < vec_start + size);
    };

addInt(vec);
    addInt(vec);

// elements fit the inline buffer
    assert(is_inline_buffer_used());

addInt(vec);

// too many elements, buffer has to be heap allocated
    assert(!is_inline_buffer_used());
}
```

# Installation

Unless tests are built, no external dependencies are required. 
The only tools you need to build **lvc** are:
 - CMake >= 3.14
 - A C++14 compatible compiler

## From source

Download/clone this repo, then build and install it as usual with CMake, e.g:
```bash
git clone https://github.com/BenjaminNavarro/lvc.git
cd lvc
mkdir build
cd build
cmake ..
cmake --build . --target install --parallel
```

Then in your project's *CMakeLists.txt* simply do:
```cmake
find_package(lvc)
target_link_libraries(my-app PRIVATE lvc::lvc)
```

## Using Conan

Add `https://bnavarro.jfrog.io/artifactory/api/conan/bnavarro` to your remotes and declare a dependency to **lvc** (e.g `lvc/11.1.0@bnavarro/stable`).

You can of course download/clone the repo then run the usual `conan install` and `conan create` commands.

## Using CPM.cmake

The project is FetchContent friendly so [CPM.cmake](https://github.com/cpm-cmake/CPM.cmake) can be used.

For instance in your *CMakeLists.txt* you could do:
```cmake
include(cmake/CPM.cmake)
CPMAddPackage("gh:BenjaminNavarro/lvc@11.1.0")
```

# Acknowledgements

The source code comes from the [LLVM](https://github.com/llvm/llvm-project) project and receives only minimal modifications: namespace changed to `lvc` and support files trimmed down to keep the number of included files low and the project small.

The initial project structure was generated by [cmake-init](https://github.com/friendlyanon/cmake-init).

# Versioning

The project's is the LLVM's version where the containers were extracted from.

The patch version may differ if the project requires fixes or if new containers are added.

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