lv2 c++

gistfile1.cpp

// ------------------------------------------------------------------------------------------------------
// State

template<class FeatureStruct>
struct Feature
{
    // pointer to feature struct
    const FeatureStruct* self;

    // wherever host supports this feature
    bool valid;

    // constructor
    Feature(const LV2_Feature* const* features, const char* const uri)
        : self(nullptr),
          valid(false)
    {
        for (int i = 0; features[i] != nullptr; ++i)
        {
            if (std::strcmp(features[i]->URI, uri) != 0)
                continue;

            self  = (const FeatureStruct*)features[i]->data;
            valid = true;
            break;
        }
    }

    // destructor (needs to be declared for virtual classes)
    virtual ~Feature() {}
};

// ------------------------------------------------------------------------------------------------------
// State

struct State_Make_Path : Feature<LV2_State_Make_Path>
{
    // constructor
    State_Make_Path(const LV2_Feature* const* features)
        : Feature<LV2_State_Make_Path>(features, LV2_URID__map) {}

    // docs for state make_path here
    char* makePath(const char* path)
    {
        LV2_CHECK_FEATURE_RETURN(stateMakePath, nullptr);

        return self->path(self->handle, path);
    }
};

// ------------------------------------------------------------------------------------------------------