// -*- C++ -*-
-/* This file is part of
- * =================================================
- *
- * LyX, The Document Processor
- * Copyright 1995 Matthias Ettrich.
- * Copyright 1995-2000 The LyX Team.
+/**
+ * \file translator.h
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
*
- * This file Copyright 2000 Baruch Even
- * ================================================= */
+ * \author Baruch Even
+ *
+ * Full author contact details are available in file CREDITS
+ */
#ifndef TRANSLATOR_H
#define TRANSLATOR_H
#include <functional>
#include "support/LAssert.h"
-
-// Functors used in the template.
-
-///
-template<typename T1, typename T2>
-class equal_1st_in_pair {
-public:
- ///
- equal_1st_in_pair(T1 const & value) : value_(value) {}
- ///
- typedef std::pair<T1, T2> pair_type;
- ///
- bool operator() (pair_type const & p) const {
- return p.first == value_;
- }
-private:
- ///
- T1 const & value_;
-};
-
-
-///
-template<typename T1, typename T2>
-class equal_2nd_in_pair {
-public:
- ///
- equal_2nd_in_pair(T2 const & value) : value_(value) {}
- ///
- typedef std::pair<T1, T2> pair_type;
- ///
- bool operator() (pair_type const & p) const {
- return p.second == value_;
- }
-private:
- ///
- T2 const & value_;
-};
-
-
-/** This class template is used to translate between two elements, specifically
- it was worked out to translate between an enum and strings when reading
- the lyx file.
-
- The two template arguments should be of different types.
-*/
+#include "support/lyxfunctional.h"
+/**
+ * This class template is used to translate between two elements, specifically
+ * it was worked out to translate between an enum and strings when reading
+ * the lyx file.
+ *
+ * The two template arguments should be of different types.
+ */
template<typename T1, typename T2>
class Translator {
public:
typedef std::pair<T1, T2> MapPair;
///
typedef std::vector<MapPair> Map;
-
+
///
- Translator(T1 const & t1, T2 const & t2)
- : default_t1(t1), default_t2(t2)
+ Translator(T1 const & t1, T2 const & t2)
+ : default_t1(t1), default_t2(t2)
{}
-
+
/// Add a mapping to the translator.
void addPair(T1 const & first, T2 const & second) {
map.push_back(MapPair(first, second));
}
-
+
/// Find the mapping for the first argument
T2 const & find(T1 const & first) const {
Assert(!map.empty());
-
+
// For explanation see the next find() function.
- Map::const_iterator it =
+ typename Map::const_iterator it =
std::find_if(map.begin(), map.end(),
- equal_1st_in_pair<T1, T2>(first)
+ lyx::equal_1st_in_pair<MapPair>(first)
);
-
+
if (it != map.end()) {
- return (*it).second;
+ return it->second;
} else {
return default_t2;
}
}
-
+
/// Find the mapping for the second argument
T1 const & find(T2 const & second) const {
Assert(!map.empty());
-
+
// The idea is as follows:
// find_if() will try to compare the data in the vector with
// the value. The vector is made of pairs and the value has
- // the type of the second part of the pair.
+ // the type of the second part of the pair.
// We thus give find_if() an equal_to functor and assign to
// its second post the value we want to compare. We now
// compose the equal_to functor with the select2nd functor
// to take only the second value of the pair to be compared.
//
// We can depict it as follows:
- // equal_to( select2nd(pair) , second)
- Map::const_iterator it =
+ // equal_to(select2nd(pair) , second)
+ typename Map::const_iterator it =
std::find_if(map.begin(), map.end(),
- equal_2nd_in_pair<T1, T2>(second)
+ lyx::equal_2nd_in_pair<MapPair>(second)
);
-
+
if (it != map.end())
- return (*it).first;
+ return it->first;
else {
return default_t1;
}
T2 const default_t2;
};
-#endif
+#endif // TRANSLATOR_H