public abstract class CppLibraryElement extends CppSourceElement {
    public abstract SourceElement getPublicHeaders();

    public SourceElement getPrivateHeaders() {
        return empty();
    }

    @Override
    public SourceElement getHeaders() {
        return ofElements(getPublicHeaders(), getPrivateHeaders());
    }

    /**
     * Returns a copy of this library with the public headers the 'public' headers directory.
     */

     */
    ConfigurableFileCollection getPrivateHeaders();

    /**
     * Configures the private header directories for this component.
     */
    void privateHeaders(Action<? super ConfigurableFileCollection> action);

    /**
     * Returns the private header include directories of this component, as defined in {@link #getPrivateHeaders()}.
     */
    FileCollection getPrivateHeaderDirs();

    /**

    final SourceFileElement header
    final SourceFileElement privateHeader
    final SourceFileElement source

    SourceElement getPublicHeaders() {
        return header
    }

    SourceElement getPrivateHeaders() {
        return privateHeader
    }

    SourceElement getSources() {
        return source
    }

    CppGreeterFunctionUsesLogger(String publicHeaderDir = "public") {

        ofElements(greeter.headers, sum.headers)
    }

    SourceElement getPublicHeaders() {
        ofElements(greeter.publicHeaders, sum.publicHeaders)
    }

    SourceElement getPrivateHeaders() {
        ofElements(greeter.privateHeaders, sum.privateHeaders)
    }

    @Override
    SourceElement getSources() {
        ofElements(greeter.sources, sum.sources)
    }

    final SourceFileElement header
    final SourceFileElement privateHeader
    final SourceFileElement source

    SourceElement getPublicHeaders() {
        return header
    }

    SourceElement getPrivateHeaders() {
        return privateHeader
    }

    SourceElement getSources() {
        return source
    }

    CppGreeterFunctionUsesLoggerApi(String publicHeaderDir = "public") {

    final SourceFileElement header
    final SourceFileElement privateHeader
    final SourceFileElement source

    SourceElement getPublicHeaders() {
        return header
    }

    SourceElement getPrivateHeaders() {
        return privateHeader
    }

    SourceElement getSources() {
        return source
    }

    CppGreeter(String publicHeaderDir = "headers") {

    final SourceFileElement header
    final SourceFileElement privateHeader
    final SourceFileElement source

    SourceElement getPublicHeaders() {
        return header
    }

    SourceElement getPrivateHeaders() {
        return privateHeader
    }

    SourceElement getSources() {
        return source
    }

    CppGreeterFunction(String publicHeaderDir = "headers") {

        return baseName;
    }

    @Override
    public FileCollection getCppSource() {
        return cppSource;
    }

    @Override
    public ConfigurableFileCollection getPrivateHeaders() {
        return privateHeaders;
    }

    @Override
    public void privateHeaders(Action<? super ConfigurableFileCollection> action) {
        action.execute(privateHeaders);
    }