Test project to show how C++ and Zig can interchangeably call function from both languages, and compile to a single binary.

This works by exposing a C API from the C++ source defining an export interface, and by defining extern functions and data in Zig by using the extern keyword. In build.zig the build process is neatly defined where one can extend it by adding C/C++ dependencies and which files to include and build. LibCpp is also enabled and linked to the main executable in build.zig:

const exe = b.addExecutable(.{
    .name = "zig-cpp-test",
    .root_source_file = b.path("src/main.zig"),
    .target = target,
    .optimize = optimize,
});

// add the C++ source files to the executable
exe.addCSourceFiles(.{
    .root = b.path("cpp-src/"),
    .files = &.{"wrapper.cpp"},
});
exe.installHeadersDirectory(b.path("cpp-src/"), "", .{
    .include_extensions = &.{"h"},
});
exe.linkLibCpp();