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/usr/include/Wt/WMessageResources is in libwt-dev 3.3.6+dfsg-1.1.

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The actual contents of the file can be viewed below.

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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WMESSAGE_RESOURCES_
#define WMESSAGE_RESOURCES_

#include <string>
#include <vector>
#include <map>
#include <set>
#include <Wt/WFlags>
#include <Wt/WMessageResourceBundle>
#include <Wt/WDllDefs.h>

namespace Wt {

class WString;

class WT_API WMessageResources
{
public:
  WMessageResources(const std::string& path, bool loadInMemory = true);
  WMessageResources(const char *builtin);

  void hibernate();

  bool isBuiltin(const char *data) const { return builtin_ == data; }
  const std::string& path() const { return path_; }

  bool resolveKey(const std::string& key, std::string& result);
  bool resolvePluralKey(const std::string& key, 
			std::string& result, 
			::uint64_t amount);

  static int evalPluralCase(const std::string &expression, ::uint64_t n);
 
  void refresh();

  std::set<std::string> keys(WFlags<WMessageResourceBundle::Scope> scope) const;

  typedef std::map<std::string, std::vector<std::string> > KeyValuesMap;

private:
  const bool loadInMemory_;
  bool loaded_;
  const std::string path_;
  const char *builtin_;

  struct Resource {
    KeyValuesMap map_;
    std::string pluralExpression_;
    unsigned pluralCount_;
  };

  Resource local_;
  Resource defaults_;

  bool readResourceFile(const std::string& locale, Resource& resource);
  bool readResourceStream(std::istream &s, Resource& resource,
                          const std::string &fileName);

  std::string findCase(const std::vector<std::string> &cases,
		       std::string pluralExpression,
		       ::uint64_t amount);
};



}

#endif // WMESSAGE_RESOURCES_