X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fprops%2Fprops.hxx;h=984bb1b5717b37657b03ff9db88714910a39ca4c;hb=3ec5e85485d00dc26799f7870420dfbb2bac7486;hp=cc1ed537e700837759baca30dea4c5d864541f5f;hpb=56c4ba67c6249f4f8779ccf710ceb650c7c81acf;p=simgear.git
diff --git a/simgear/props/props.hxx b/simgear/props/props.hxx
index cc1ed537..984bb1b5 100644
--- a/simgear/props/props.hxx
+++ b/simgear/props/props.hxx
@@ -18,6 +18,10 @@
#include
#include
+#include
+#include
+
+#include
#if PROPS_STANDALONE
#else
@@ -26,10 +30,49 @@
#endif
-
+#include
#include
#include
+// XXX This whole file should be in the simgear namespace, but I don't
+// have the guts yet...
+
+namespace simgear
+{
+template
+std::istream& readFrom(std::istream& stream, T& result)
+{
+ stream >> result;
+ return stream;
+}
+
+/**
+ * Parse a string as an object of a given type.
+ * XXX no error behavior yet.
+ *
+ * @tparam T the return type
+ * @param str the string
+ * @return the object.
+ */
+template
+inline T parseString(const std::string& str)
+{
+ std::istringstream stream(str);
+ T result;
+ readFrom(stream, result);
+ return result;
+}
+
+// Extended properties
+template<>
+std::istream& readFrom(std::istream& stream, SGVec3d& result);
+template<>
+std::istream& readFrom(std::istream& stream, SGVec4d& result);
+
+
+/**
+ * Property value types.
+ */
#ifdef NONE
#pragma warn A sloppy coder has defined NONE as a macro!
@@ -76,6 +119,68 @@
#undef STRING
#endif
+namespace props
+{
+/**
+ * The possible types of an SGPropertyNode. Types that appear after
+ * EXTENDED are not stored in the SGPropertyNode itself.
+ */
+enum Type {
+ NONE = 0, /**< The node hasn't been assigned a value yet. */
+ ALIAS, /**< The node "points" to another node. */
+ BOOL,
+ INT,
+ LONG,
+ FLOAT,
+ DOUBLE,
+ STRING,
+ UNSPECIFIED,
+ EXTENDED, /**< The node's value is not stored in the property;
+ * the actual value and type is retrieved from an
+ * SGRawValue node. This type is never returned by @see
+ * SGPropertyNode::getType.
+ */
+ // Extended properties
+ VEC3D,
+ VEC4D
+};
+
+template struct PropertyTraits;
+
+#define DEFINTERNALPROP(TYPE, PROP) \
+template<> \
+struct PropertyTraits \
+{ \
+ static const Type type_tag = PROP; \
+ enum { Internal = 1 }; \
+}
+
+DEFINTERNALPROP(bool, BOOL);
+DEFINTERNALPROP(int, INT);
+DEFINTERNALPROP(long, LONG);
+DEFINTERNALPROP(float, FLOAT);
+DEFINTERNALPROP(double, DOUBLE);
+DEFINTERNALPROP(const char *, STRING);
+DEFINTERNALPROP(const char[], STRING);
+#undef DEFINTERNALPROP
+
+template<>
+struct PropertyTraits
+{
+ static const Type type_tag = VEC3D;
+ enum { Internal = 0 };
+};
+
+template<>
+struct PropertyTraits
+{
+ static const Type type_tag = VEC4D;
+ enum { Internal = 0 };
+};
+}
+}
+
+
////////////////////////////////////////////////////////////////////////
@@ -90,6 +195,74 @@
// a small performance hit for that.
////////////////////////////////////////////////////////////////////////
+/**
+ * Base class for SGRawValue classes that holds no type
+ * information. This allows some generic manipulation of the
+ * SGRawValue object.
+ */
+class SGRaw
+{
+public:
+ /**
+ * Get the type enumeration for the raw value.
+ *
+ * @return the type.
+ */
+ virtual simgear::props::Type getType() const = 0;
+ virtual ~SGRaw() {}
+
+ /**
+ * Create a new deep copy of this raw value.
+ *
+ * The copy will contain its own version of the underlying value
+ * as well, and will be the same type.
+ *
+ * @return A deep copy of the current object.
+ */
+ virtual SGRaw* clone() const = 0;
+
+};
+
+class SGRawExtended : public SGRaw
+{
+public:
+ /**
+ * Make an SGRawValueContainer from the SGRawValue.
+ *
+ * This is a virtual function of SGRawExtended so that
+ * SGPropertyNode::untie doesn't need to know the type of an
+ * extended property.
+ */
+ virtual SGRawExtended* makeContainer() const = 0;
+ /**
+ * Write value out to a stream
+ */
+ virtual std::ostream& printOn(std::ostream& stream) const = 0;
+ /**
+ * Read value from a stream and store it.
+ */
+ virtual std::istream& readFrom(std::istream& stream) = 0;
+};
+
+// Choose between different base classes based on whether the value is
+// stored internal to the property node. This frees us from defining
+// the virtual functions in the SGRawExtended interface where they
+// don't make sense, e.g. readFrom for the const char* type.
+template::Internal>
+class SGRawBase;
+
+template
+class SGRawBase : public SGRaw
+{
+};
+
+template
+class SGRawBase : public SGRawExtended
+{
+ virtual SGRawExtended* makeContainer() const;
+ virtual std::ostream& printOn(std::ostream& stream) const;
+ virtual std::istream& readFrom(std::istream& stream);
+};
/**
* Abstract base class for a raw value.
@@ -108,10 +281,7 @@
* set, and clone the underlying value. The SGRawValue may change
* frequently during a session as a value is retyped or bound and
* unbound to various data source, but the abstract SGPropertyNode
- * layer insulates the application from those changes. The raw value
- * contains no facilities for data binding or for type conversion: it
- * is simply the abstraction of a primitive data type (or a compound
- * data type, in the case of a string).
+ * layer insulates the application from those changes.
*
* The SGPropertyNode class always keeps a *copy* of a raw value,
* not the original one passed to it; if you override a derived class
@@ -127,9 +297,10 @@
* @see SGRawValueFunctionsIndexed
* @see SGRawValueMethods
* @see SGRawValueMethodsIndexed
+ * @see SGRawValueContainer
*/
template
-class SGRawValue
+class SGRawValue : public SGRawBase
{
public:
@@ -142,7 +313,10 @@ public:
* may need different kinds of default values (such as epoch for a
* date type). The default value is used when creating new values.
*/
- static const T DefaultValue; // Default for this kind of raw value.
+ static T DefaultValue()
+ {
+ return T();
+ }
/**
@@ -184,17 +358,30 @@ public:
/**
- * Create a new deep copy of this raw value.
- *
- * The copy will contain its own version of the underlying value
- * as well.
- *
- * @return A deep copy of the current object.
+ * Return the type tag for this raw value type.
*/
- virtual SGRawValue * clone () const = 0;
+ virtual simgear::props::Type getType() const
+ {
+ return simgear::props::PropertyTraits::type_tag;
+ }
};
+
+////////////////////////////////////////////////////////////////////////
+// Default values for every type.
+////////////////////////////////////////////////////////////////////////
+
+template<> inline bool SGRawValue::DefaultValue()
+{
+ return false;
+}
+
+template<> inline const char * SGRawValue::DefaultValue()
+{
+ return "";
+}
+
/**
* A raw value bound to a pointer.
*
@@ -247,8 +434,8 @@ public:
*
* The copy will use the same external pointer as the original.
*/
- virtual SGRawValue * clone () const {
- return new SGRawValuePointer(_ptr);
+ virtual SGRaw* clone () const {
+ return new SGRawValuePointer(_ptr);
}
private:
@@ -304,7 +491,7 @@ public:
*/
virtual T getValue () const {
if (_getter) return (*_getter)();
- else return SGRawValue::DefaultValue;
+ else return SGRawValue::DefaultValue();
}
/**
@@ -322,8 +509,8 @@ public:
/**
* Create a copy of this raw value, bound to the same functions.
*/
- virtual SGRawValue * clone () const {
- return new SGRawValueFunctions(_getter,_setter);
+ virtual SGRaw* clone () const {
+ return new SGRawValueFunctions(_getter,_setter);
}
private:
@@ -353,14 +540,14 @@ public:
virtual ~SGRawValueFunctionsIndexed () {}
virtual T getValue () const {
if (_getter) return (*_getter)(_index);
- else return SGRawValue::DefaultValue;
+ else return SGRawValue::DefaultValue();
}
virtual bool setValue (T value) {
if (_setter) { (*_setter)(_index, value); return true; }
else return false;
}
- virtual SGRawValue * clone () const {
- return new SGRawValueFunctionsIndexed(_index, _getter, _setter);
+ virtual SGRaw* clone () const {
+ return new SGRawValueFunctionsIndexed(_index, _getter, _setter);
}
private:
int _index;
@@ -386,14 +573,14 @@ public:
virtual ~SGRawValueMethods () {}
virtual T getValue () const {
if (_getter) { return (_obj.*_getter)(); }
- else { return SGRawValue::DefaultValue; }
+ else { return SGRawValue::DefaultValue(); }
}
virtual bool setValue (T value) {
if (_setter) { (_obj.*_setter)(value); return true; }
else return false;
}
- virtual SGRawValue * clone () const {
- return new SGRawValueMethods(_obj, _getter, _setter);
+ virtual SGRaw* clone () const {
+ return new SGRawValueMethods(_obj, _getter, _setter);
}
private:
C &_obj;
@@ -420,14 +607,14 @@ public:
virtual ~SGRawValueMethodsIndexed () {}
virtual T getValue () const {
if (_getter) { return (_obj.*_getter)(_index); }
- else { return SGRawValue::DefaultValue; }
+ else { return SGRawValue::DefaultValue(); }
}
virtual bool setValue (T value) {
if (_setter) { (_obj.*_setter)(_index, value); return true; }
else return false;
}
- virtual SGRawValue * clone () const {
- return new SGRawValueMethodsIndexed(_obj, _index, _getter, _setter);
+ virtual SGRaw* clone () const {
+ return new SGRawValueMethodsIndexed(_obj, _index, _getter, _setter);
}
private:
C &_obj;
@@ -436,6 +623,77 @@ private:
setter_t _setter;
};
+/**
+ * A raw value that contains its value. This provides a way for
+ * property nodes to contain values that shouldn't be stored in the
+ * property node itself.
+ */
+template
+class SGRawValueContainer : public SGRawValue
+{
+public:
+
+ /**
+ * Explicit constructor.
+ */
+ SGRawValueContainer(const T& obj) : _obj(obj) {}
+
+ /**
+ * Destructor.
+ */
+ virtual ~SGRawValueContainer() {}
+
+ /**
+ * Get the underlying value.
+ */
+ virtual T getValue() const { return _obj; }
+
+ /**
+ * Set the underlying value.
+ *
+ * This method will dereference the pointer and change the
+ * variable's value.
+ */
+ virtual bool setValue (T value) { _obj = value; return true; }
+
+ /**
+ * Create a copy of this raw value.
+ */
+ virtual SGRaw* clone () const {
+ return new SGRawValueContainer(_obj);
+ }
+
+private:
+ T _obj;
+};
+
+template
+SGRawExtended* SGRawBase::makeContainer() const
+{
+ return new SGRawValueContainer(static_cast*>(this)
+ ->getValue());
+}
+
+template
+std::ostream& SGRawBase::printOn(std::ostream& stream) const
+{
+ return stream << static_cast*>(this)->getValue();
+}
+
+template
+std::istream& SGRawBase::readFrom(std::istream& stream)
+{
+ T value;
+ simgear::readFrom(stream, value);
+ static_cast*>(this)->setValue(value);
+ return stream;
+}
+
+template<>
+std::ostream& SGRawBase::printOn(std::ostream& stream) const;
+template<>
+std::ostream& SGRawBase::printOn(std::ostream& stream) const;
+
/**
* The smart pointer that manage reference counting
@@ -444,6 +702,11 @@ class SGPropertyNode;
typedef SGSharedPtr SGPropertyNode_ptr;
typedef SGSharedPtr SGConstPropertyNode_ptr;
+namespace simgear
+{
+typedef std::vector PropertyList;
+}
+
/**
* The property change listener interface.
@@ -484,22 +747,6 @@ public:
MAX_STRING_LEN = 1024
};
- /**
- * Property value types.
- */
- enum Type {
- NONE = 0,
- ALIAS,
- BOOL,
- INT,
- LONG,
- FLOAT,
- DOUBLE,
- STRING,
- UNSPECIFIED
- };
-
-
/**
* Access mode attributes.
*
@@ -550,7 +797,7 @@ public:
/**
* Test whether this node contains a primitive leaf value.
*/
- bool hasValue () const { return (_type != NONE); }
+ bool hasValue () const { return (_type != simgear::props::NONE); }
/**
@@ -558,11 +805,15 @@ public:
*/
const char * getName () const { return _name.c_str(); }
+ /**
+ * Get the node's simple name as a string.
+ */
+ const std::string& getNameString () const { return _name; }
/**
* Get the node's pretty display name, with subscript when needed.
*/
- const char * getDisplayName (bool simplify = false) const;
+ std::string getDisplayName (bool simplify = false) const;
/**
@@ -591,7 +842,7 @@ public:
/**
* Get the number of child nodes.
*/
- int nChildren () const { return _children.size(); }
+ int nChildren () const { return (int)_children.size(); }
/**
@@ -630,17 +881,10 @@ public:
/**
* Get a child node by name and index.
*/
- SGPropertyNode * getChild (const char * name, int index = 0,
- bool create = false);
-
- /**
- * Get a child node by name and index.
- */
+ SGPropertyNode * getChild (const char* name, int index = 0,
+ bool create = false);
SGPropertyNode * getChild (const std::string& name, int index = 0,
- bool create = false)
- { return getChild(name.c_str(), index, create); }
-
-
+ bool create = false);
/**
* Get a const child node by name and index.
*/
@@ -656,12 +900,12 @@ public:
/**
* Get a vector of all children with the specified name.
*/
- std::vector getChildren (const char * name) const;
+ simgear::PropertyList getChildren (const char * name) const;
/**
* Get a vector of all children with the specified name.
*/
- std::vector getChildren (const std::string& name) const
+ simgear::PropertyList getChildren (const std::string& name) const
{ return getChildren(name.c_str()); }
/**
@@ -686,15 +930,13 @@ public:
/**
* Remove all children with the specified name.
*/
- std::vector removeChildren (const char * name,
- bool keep = true);
-
+ simgear::PropertyList removeChildren (const char * name, bool keep = true);
/**
* Remove all children with the specified name.
*/
- std::vector removeChildren (const std::string& name,
- bool keep = true)
+ simgear::PropertyList removeChildren (const std::string& name,
+ bool keep = true)
{ return removeChildren(name.c_str(), keep); }
//
@@ -729,7 +971,7 @@ public:
/**
* Test whether the node's leaf value is aliased to another's.
*/
- bool isAlias () const { return (_type == ALIAS); }
+ bool isAlias () const { return (_type == simgear::props::ALIAS); }
/**
@@ -874,7 +1116,7 @@ public:
/**
* Get the type of leaf value, if any, for this node.
*/
- Type getType () const;
+ simgear::props::Type getType () const;
/**
@@ -912,7 +1154,17 @@ public:
*/
const char * getStringValue () const;
-
+ /**
+ * Get a value from a node. If the actual type of the node doesn't
+ * match the desired type, a conversion isn't guaranteed.
+ */
+ template
+ T getValue(typename boost::enable_if_c::Internal>
+ ::type* dummy = 0) const;
+ // Getter for extended property
+ template
+ T getValue(typename boost::disable_if_c::Internal>
+ ::type* dummy = 0) const;
/**
* Set a bool value for this node.
@@ -961,7 +1213,27 @@ public:
*/
bool setUnspecifiedValue (const char * value);
+ template
+ bool setValue(const T& val,
+ typename boost::enable_if_c::Internal>
+ ::type* dummy = 0);
+
+ template
+ bool setValue(const T& val,
+ typename boost::disable_if_c::Internal>
+ ::type* dummy = 0);
+ template
+ bool setValue(const char (&val)[N])
+ {
+ return setValue(&val[0]);
+ }
+
+ /**
+ * Print the value of the property to a stream.
+ */
+ std::ostream& printOn(std::ostream& stream) const;
+
//
// Data binding.
//
@@ -972,42 +1244,11 @@ public:
*/
bool isTied () const { return _tied; }
-
- /**
- * Bind this node to an external bool source.
- */
- bool tie (const SGRawValue &rawValue, bool useDefault = true);
-
-
- /**
- * Bind this node to an external int source.
- */
- bool tie (const SGRawValue &rawValue, bool useDefault = true);
-
-
- /**
- * Bind this node to an external long int source.
- */
- bool tie (const SGRawValue &rawValue, bool useDefault = true);
-
-
- /**
- * Bind this node to an external float source.
- */
- bool tie (const SGRawValue &rawValue, bool useDefault = true);
-
-
- /**
- * Bind this node to an external double source.
- */
- bool tie (const SGRawValue &rawValue, bool useDefault = true);
-
-
- /**
- * Bind this node to an external string source.
- */
- bool tie (const SGRawValue &rawValue, bool useDefault = true);
-
+ /**
+ * Bind this node to an external source.
+ */
+ template
+ bool tie(const SGRawValue &rawValue, bool useDefault = true);
/**
* Unbind this node from any external data source.
@@ -1024,12 +1265,12 @@ public:
/**
* Get another node's type.
*/
- Type getType (const char * relative_path) const;
+ simgear::props::Type getType (const char * relative_path) const;
/**
* Get another node's type.
*/
- Type getType (const std::string& relative_path) const
+ simgear::props::Type getType (const std::string& relative_path) const
{ return getType(relative_path.c_str()); }
/**
@@ -1190,12 +1431,17 @@ public:
*/
bool setStringValue (const char * relative_path, const char * value);
+ bool setStringValue(const char * relative_path, const std::string& value)
+ { return setStringValue(relative_path, value.c_str()); }
/**
* Set another node's value as a string.
*/
bool setStringValue (const std::string& relative_path, const char * value)
{ return setStringValue(relative_path.c_str(), value); }
+ bool setStringValue (const std::string& relative_path,
+ const std::string& value)
+ { return setStringValue(relative_path.c_str(), value.c_str()); }
/**
* Set another node's value with no specified type.
@@ -1327,7 +1573,7 @@ public:
/**
* Get the number of listeners.
*/
- int nListeners () const { return _listeners ? _listeners->size() : 0; }
+ int nListeners () const { return _listeners ? (int)_listeners->size() : 0; }
/**
@@ -1353,6 +1599,16 @@ public:
*/
void clearValue ();
+ /**
+ * Compare two property trees. The property trees are equal if: 1)
+ * They have no children, and have the same type and the values are
+ * equal, or 2) have the same number of children, and the
+ * corresponding children in each tree are equal. "corresponding"
+ * means have the same name and index.
+ *
+ * Attributes, removed children, and aliases aren't considered.
+ */
+ static bool compare (const SGPropertyNode& lhs, const SGPropertyNode& rhs);
protected:
@@ -1363,12 +1619,13 @@ protected:
/**
* Protected constructor for making new nodes on demand.
*/
- SGPropertyNode (const char * name, int index, SGPropertyNode * parent);
-
+ SGPropertyNode (const std::string& name, int index, SGPropertyNode * parent);
+ template
+ SGPropertyNode (Itr begin, Itr end, int index, SGPropertyNode * parent);
private:
- // Get the raw value
+ // Get the raw value
bool get_bool () const;
int get_int () const;
long get_long () const;
@@ -1376,7 +1633,7 @@ private:
double get_double () const;
const char * get_string () const;
- // Set the raw value
+ // Set the raw value
bool set_bool (bool value);
bool set_int (int value);
bool set_long (long value);
@@ -1390,7 +1647,6 @@ private:
*/
const char * make_string () const;
-
/**
* Trace a read access.
*/
@@ -1413,29 +1669,23 @@ private:
int _index;
std::string _name;
- mutable std::string _display_name;
/// To avoid cyclic reference counting loops this shall not be a reference
/// counted pointer
SGPropertyNode * _parent;
- std::vector _children;
- std::vector _removedChildren;
+ simgear::PropertyList _children;
+ simgear::PropertyList _removedChildren;
std::vector _linkedNodes;
mutable std::string _path;
mutable std::string _buffer;
hash_table * _path_cache;
- Type _type;
+ simgear::props::Type _type;
bool _tied;
int _attr;
- // The right kind of pointer...
+ // The right kind of pointer...
union {
SGPropertyNode * alias;
- SGRawValue * bool_val;
- SGRawValue * int_val;
- SGRawValue * long_val;
- SGRawValue * float_val;
- SGRawValue * double_val;
- SGRawValue * string_val;
+ SGRaw* val;
} _value;
union {
@@ -1451,8 +1701,8 @@ private:
/**
- * Register/unregister node that links to this node in its path cache.
- */
+ * Register/unregister node that links to this node in its path cache.
+ */
void add_linked_node (hash_table * node) { _linkedNodes.push_back(node); }
bool remove_linked_node (hash_table * node);
@@ -1509,10 +1759,21 @@ private:
unsigned int _data_length;
bucket ** _data;
};
-
+ // Pass name as a pair of iterators
+ template
+ SGPropertyNode * getChildImpl (Itr begin, Itr end, int index = 0, bool create = false);
+ // very internal method
+ template
+ SGPropertyNode* getExistingChild (Itr begin, Itr end, int index, bool create);
+ // very internal path parsing function
+ template
+ friend SGPropertyNode* find_node_aux(SGPropertyNode * current, SplitItr& itr,
+ bool create, int last_index);
+ // For boost
+ friend size_t hash_value(const SGPropertyNode& node);
};
-// Convenice functions for use in templates
+// Convenience functions for use in templates
template
T getValue(const SGPropertyNode*);
@@ -1578,6 +1839,169 @@ inline bool setValue (SGPropertyNode* node, const std::string& value)
return node->setStringValue(value.c_str());
}
+template
+bool SGPropertyNode::tie(const SGRawValue &rawValue, bool useDefault)
+{
+ using namespace simgear::props;
+ if (_type == ALIAS || _tied)
+ return false;
+
+ useDefault = useDefault && hasValue();
+ T old_val = SGRawValue::DefaultValue();
+ if (useDefault)
+ old_val = getValue(this);
+ clearValue();
+ if (PropertyTraits::Internal)
+ _type = PropertyTraits::type_tag;
+ else
+ _type = EXTENDED;
+ _tied = true;
+ _value.val = rawValue.clone();
+ if (useDefault)
+ setValue(old_val);
+ return true;
+}
+
+template<>
+bool SGPropertyNode::tie (const SGRawValue &rawValue,
+ bool useDefault);
+
+template
+T SGPropertyNode::getValue(typename boost::disable_if_c::Internal>::type* dummy) const
+{
+ using namespace simgear::props;
+ if (_attr == (READ|WRITE) && _type == EXTENDED
+ && _value.val->getType() == PropertyTraits::type_tag) {
+ return static_cast*>(_value.val)->getValue();
+ }
+ if (getAttribute(TRACE_READ))
+ trace_read();
+ if (!getAttribute(READ))
+ return SGRawValue::DefaultValue();
+ switch (_type) {
+ case EXTENDED:
+ if (_value.val->getType() == PropertyTraits::type_tag)
+ return static_cast*>(_value.val)->getValue();
+ break;
+ case STRING:
+ case UNSPECIFIED:
+ return simgear::parseString(make_string());
+ break;
+ default: // avoid compiler warning
+ break;
+ }
+ return SGRawValue::DefaultValue();
+}
+
+template
+inline T SGPropertyNode::getValue(typename boost::enable_if_c::Internal>::type* dummy) const
+{
+ return ::getValue(this);
+}
+
+template
+bool SGPropertyNode::setValue(const T& val,
+ typename boost::disable_if_c::Internal>::type* dummy)
+{
+ using namespace simgear::props;
+ if (_attr == (READ|WRITE) && _type == EXTENDED
+ && _value.val->getType() == PropertyTraits::type_tag) {
+ static_cast*>(_value.val)->setValue(val);
+ return true;
+ }
+ if (getAttribute(WRITE)
+ && ((_type == EXTENDED
+ && _value.val->getType() == PropertyTraits::type_tag)
+ || _type == NONE || _type == UNSPECIFIED)) {
+ if (_type == NONE || _type == UNSPECIFIED) {
+ clearValue();
+ _type = EXTENDED;
+ _value.val = new SGRawValueContainer(val);
+ } else {
+ static_cast*>(_value.val)->setValue(val);
+ }
+ if (getAttribute(TRACE_WRITE))
+ trace_write();
+ return true;
+ }
+ return false;
+}
+
+template
+inline bool SGPropertyNode::setValue(const T& val,
+ typename boost::enable_if_c::Internal>::type* dummy)
+{
+ return ::setValue(this, val);
+}
+
+/**
+ * Utility function for creation of a child property node.
+ */
+inline SGPropertyNode* makeChild(SGPropertyNode* parent, const char* name,
+ int index = 0)
+{
+ return parent->getChild(name, index, true);
+}
+
+/**
+ * Utility function for creation of a child property node using a
+ * relative path.
+ */
+namespace simgear
+{
+template
+inline SGPropertyNode* makeNode(SGPropertyNode* parent, const StringType& name)
+{
+ return parent->getNode(name, true);
+}
+}
+
+// For boost::hash
+size_t hash_value(const SGPropertyNode& node);
+
+// Helper comparison and hash functions for common cases
+
+namespace simgear
+{
+namespace props
+{
+struct Compare
+{
+ bool operator()(const SGPropertyNode* lhs, const SGPropertyNode* rhs) const
+ {
+ return SGPropertyNode::compare(*lhs, *rhs);
+ }
+ bool operator()(SGPropertyNode_ptr lhs, const SGPropertyNode* rhs) const
+ {
+ return SGPropertyNode::compare(*lhs, *rhs);
+ }
+ bool operator()(const SGPropertyNode* lhs, SGPropertyNode_ptr rhs) const
+ {
+ return SGPropertyNode::compare(*lhs, *rhs);
+ }
+ bool operator()(SGPropertyNode_ptr lhs, SGPropertyNode_ptr rhs) const
+ {
+ return SGPropertyNode::compare(*lhs, *rhs);
+ }
+};
+
+struct Hash
+{
+ size_t operator()(const SGPropertyNode* node) const
+ {
+ return hash_value(*node);
+ }
+ size_t operator()(SGPropertyNode_ptr node) const
+ {
+ return hash_value(*node);
+ }
+};
+}
+}
#endif // __PROPS_HXX
// end of props.hxx