RhodeCode

    typedef typename Parent::Key Key;

    typedef typename Parent::Value Value;

    /// Default constructor

    /// Default constructor.

    /// The value of the map will be default constructed.

    ConstMap() {}

    /// Constructor with specified initial value

    /// Constructor with specified initial value.

    ConstMap(const Value &v) : _value(v) {}

    /// Gives back the specified value.

    Value operator[](const Key&) const { return _value; }

    /// Absorbs the value.

    void set(const Key&, const Value&) {}

    /// Sets the value that is assigned to each key.

    void setAll(const Value &v) {

      _value = v;

    }

    ConstMap(const ConstMap<K, V1> &, const Value &v) : _value(v) {}

  };

  /// Returns a \ref ConstMap class

  /// This function just returns a \ref ConstMap class.

  /// \relates ConstMap

  template<typename K, typename V>

  inline ConstMap<K, V> constMap(const V &v) {

    return ConstMap<K, V>(v);

  }

  template<typename T, T v>

  struct Const {};

  /// Constant map with inlined constant value.

  /// This \ref concepts::ReadMap "readable map" assigns a specified

  /// value to each key.

  ///

  /// In other aspects it is equivalent to \ref NullMap.

  /// So it conforms the \ref concepts::ReadWriteMap "ReadWriteMap"

  /// concept, but it absorbs the data written to it.

  /// a functor typically does not provide \c argument_type and

  /// \c result_type typedefs.

  /// Parameter \c F is the type of the used functor.

  ///

  /// The simplest way of using this map is through the functorToMap()

  /// function.

  ///

  /// \sa MapToFunctor

  template<typename F,

	   typename K = typename F::argument_type,

	   typename V = typename F::result_type>

  class FunctorToMap : public MapBase<K, V> {

  public:

    typedef MapBase<K, V> Parent;

    typedef typename Parent::Key Key;

    typedef typename Parent::Value Value;

    /// Constructor

    FunctorToMap(const F &f = F()) : _f(f) {}

    /// \e

    Value operator[](const Key &k) const { return _f(k); }

  };

  /// Returns a \ref FunctorToMap class

  // NullMap

  {

    checkConcept<ReadWriteMap<A,B>, NullMap<A,B> >();

    NullMap<A,B> map1;

    NullMap<A,B> map2 = map1;

    map1 = nullMap<A,B>();

  }

  // ConstMap

  {

    checkConcept<ReadWriteMap<A,B>, ConstMap<A,B> >();

    ConstMap<A,B> map1;

    ConstMap<A,B> map2(B());

    ConstMap<A,B> map3 = map1;

    map1 = constMap<A>(B());

    map1.setAll(B());

    checkConcept<ReadWriteMap<A,int>, ConstMap<A,int> >();

    check(constMap<A>(10)[A()] == 10, "Something is wrong with ConstMap");

    checkConcept<ReadWriteMap<A,int>, ConstMap<A,Const<int,10> > >();

  }

  // IdentityMap

  {

    checkConcept<ReadMap<A,A>, IdentityMap<A> >();

    IdentityMap<A> map1;

    IdentityMap<A> map2 = map1;

    map1 = identityMap<A>();

    checkConcept<ReadMap<double,double>, IdentityMap<double> >();

    check(identityMap<double>()[1.0] == 1.0 && identityMap<double>()[3.14] == 3.14,

          "Something is wrong with IdentityMap");