}

    EnsureIsCopied();
    impl_->insert(resource_op);
  }

  Impl::const_iterator begin() const {
    return impl_ ? impl_->begin() : GetEmptyImpl()->begin();
  }

  Impl::const_iterator end() const {
    return impl_ ? impl_->end() : GetEmptyImpl()->end();
  }

  bool Contains(const ResourceOp& resource_op) const {
    return impl_ != nullptr && impl_->count(resource_op);
  }

 private:

  explicit ParamGenerator(ParamGeneratorInterface<T>* impl) : impl_(impl) {}
  ParamGenerator(const ParamGenerator& other) : impl_(other.impl_) {}

  ParamGenerator& operator=(const ParamGenerator& other) {
    impl_ = other.impl_;
    return *this;
  }

  iterator begin() const { return iterator(impl_->Begin()); }
  iterator end() const { return iterator(impl_->End()); }

 private:

  explicit ParamGenerator(ParamGeneratorInterface<T>* impl) : impl_(impl) {}
  ParamGenerator(const ParamGenerator& other) : impl_(other.impl_) {}

  ParamGenerator& operator=(const ParamGenerator& other) {
    impl_ = other.impl_;
    return *this;
  }

  iterator begin() const { return iterator(impl_->Begin()); }
  iterator end() const { return iterator(impl_->End()); }

 private:

namespace tensorflow {

Scope::Scope(Impl* impl) : impl_(impl) {}

Scope::Scope(const Scope& other) : impl_(new Impl(*other.impl())) {}

Scope::~Scope() {}

Scope& Scope::operator=(const Scope& other) {
  // We can't copy Impls because of the const members, use copy ctor instead
  impl_.reset(new Impl(*other.impl_));
  return *this;
}

namespace {
const char kScopeSeparator[] = "/";

  // START_SKIP_DOXYGEN
  class Impl;
  Impl* impl() { return impl_.get(); }
  const Impl* impl() const { return impl_.get(); }
  // END_SKIP_DOXYGEN

 private:
  Scope WithOpNameImpl(const string& op_name) const;

  friend class InternalScope;
  std::unique_ptr<Impl> impl_;
  explicit Scope(Impl*);
};

  %1 = "tf.Identity"(%0) {device = ""} : (tensor<2xf32>) -> tensor<*xf32>
  %2 = "tf.Identity"(%1) {device = ""} : (tensor<*xf32>) -> tensor<*xf32>
  return %2 : tensor<*xf32>
}
func.func private @XlaCallModule_aten.hardswish.default.impl_0(%arg0: tensor<2xf32>) -> tensor<2xf32> {
  %0 = mhlo.constant dense<6.000000e+00> : tensor<f32>

        1 * classLoader.loadClass("org.gradle.Impl1") >> String
        1 * classLoader.loadClass("org.gradle.Impl2") >> StringBuilder
    }

    def "getAll() ignores duplicate implementation classes"() {
        def impl1 = stream("org.gradle.Impl1")
        def impl2 = stream("org.gradle.Impl2")
        def impl3 = stream("org.gradle.Impl1")

        when:

        source impl: ["class SomeImpl {}", "class ImplB extends B {}", "class ImplB2 extends ImplB {}"]
        impl.snapshot { run language.compileTaskName }

        when:
        source api: ["class B { /* remove extends */ }"]
        run "impl:${language.compileTaskName}"

        then:
        impl.recompiledClasses("ImplB", "ImplB2")

        when:
        impl.snapshot()

            impl: ["class ImplA { $constantType foo() { return B.x; }}", "class ImplB {int foo() { return 2; }}"]
        impl.snapshot { run language.compileTaskName }

        when:
        source api: ["class B { final static $constantType x = $newValue; }"]
        run "impl:${language.compileTaskName}"

        then:
        impl.recompiledClasses('ImplA')

        where:
        constantType | constantValue   | newValue

        source api: ["class A {}", "class B {}"], impl: ["class ImplA extends A {}", "class ImplB extends B {}"]
        impl.snapshot { run language.compileTaskName }

        when:
        source api: ["class A { String change; }"]
        run "impl:${language.compileTaskName}"

        then:
        impl.recompiledClasses("ImplA")
    }