just-dl

Load functions from shared libraries in a cross-platform way, on Linux and Windows

I built this library for myself. It requires at least C++17. I tested it on GCC 13.2 and MSVC 19.39.

If you want to use this library and need a specific flag in either dlopen, or LoadLibrary, that is not present in this library, open up an issue and I will try to implement it. If you want macOS support with Clang, just try to build the library and tell me if it works. Or if you have any other suggestions, feel free to open an issue.

Check the header files for documentation and check out tests/**/main.cpp for some examples.

Usage

To use this library, include it as a submodule:

git submodule add -b stable -- https://github.com/SimonMaracine/just-dl.git <path/to/submodule/folder>

Then write this in CMakeLists.txt:

add_subdirectory(<path/to/submodule/folder>)
target_link_libraries(<your_target> PRIVATE just_dl)

To build with tests, add this:

set(JUST_DL_BUILD_TESTS ON)

The CMake script builds the library by default as static. If you want it dynamic:

set(BUILD_SHARED_LIBS ON)

Example

#include <iostream>
#include <just_dl/just_dl.hpp>

using Cosine = double(*)(double);

int main() {
    just_dl::Error err;

    void* handle {just_dl::open_library("libm.so.6", 0, err)};

    if (err) {
        std::cout << "Could not open math library: " << err.message() << '\n';
        return 1;
    }

    Cosine cosine {reinterpret_cast<Cosine>(
        just_dl::load_function(handle, "cos", err)
    )};

    if (err) {
        std::cout << "Could not load function: " << err.message() << '\n';
        return 1;
    }

    std::cout << cosine(0.0) << '\n';

    just_dl::close_library(handle, err);

    if (err) {
        std::cout << "Could not close math library: " << err.message() << '\n';
        return 1;
    }

    return 0;
}