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/usr/include/Wt/WJavaScriptPreamble is in libwt-dev 3.1.10-1ubuntu2.

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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2010 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WT_JAVASCRIPT_PREAMBLE_H_
#define WT_JAVASCRIPT_PREAMBLE_H_

#include <Wt/WObject>

#define WT_JS(...) #__VA_ARGS__

namespace Wt {
  enum JavaScriptObjectType {
    JavaScriptFunction,     // called with this == WT
    JavaScriptConstructor,
    JavaScriptObject,
    JavaScriptPrototype
  };

  enum JavaScriptScope {
    ApplicationScope,
    WtClassScope
  };

  class WT_API WJavaScriptPreamble {
  public:
    WJavaScriptPreamble(JavaScriptScope scope, JavaScriptObjectType type,
			const char *name, const char *src);

    JavaScriptScope scope;
    JavaScriptObjectType type;
    const char *name, *src;
  };
}

#ifndef WT_DEBUG_JS

#define WT_DECLARE_WT_MEMBER(i, type, name, ...)			\
  namespace {								\
  using namespace Wt;							\
  WJavaScriptPreamble wtjs##i() {					\
    return WJavaScriptPreamble(WtClassScope, type, name, #__VA_ARGS__); \
  }									\
  }

#define WT_DECLARE_APP_MEMBER(i, type, name, ...)			\
  namespace {								\
  using namespace Wt;							\
  WJavaScriptPreamble appjs##i() {					\
    return WJavaScriptPreamble(ApplicationScope, type, name, #__VA_ARGS__); \
  }									\
  }

#define LOAD_JAVASCRIPT(app, jsFile, name, jsi)	\
  app->loadJavaScript(jsFile, jsi())

#else // !WT_DEBUG_JS

#define LOAD_JAVASCRIPT(app, jsFile, name, jsi)	\
  app->loadJavaScript(jsFile)

#endif // WT_DEBUG_JS

#endif // WT_JAVASCRIPT_PREAMBLE_H_