First round of dead file removal

experimental/c_salt/converting_visitor.h

-// Copyright 2010 The Ginsu Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can
-// be found in the LICENSE file.
-
-#ifndef C_SALT_CONVERTING_VISITOR_H_
-#define C_SALT_CONVERTING_VISITOR_H_
-
-#include <string>
-
-#include "boost/shared_ptr.hpp"
-#include "boost/variant/static_visitor.hpp"
-#include "c_salt/scriptable_native_object_ptrs.h"
-#include "c_salt/scriptable_native_object.h"
-#include "c_salt/scripting_interface_ptrs.h"
-
-namespace c_salt {
-
-class ScriptingInterface;
-
-// The following set of ConvertingVisitor template specializations implement the
-// Visitor concept, as described here:
-// http://live.boost.org/doc/libs/1_41_0/doc/html/variant/reference.html
-//   #variant.concepts.static-visitor
-// Each instantiation of ConvertingVisitor can be passed as a static visitor to
-// the boost::apply_visitor function.  ConvertingVisitor<TargetType> converts
-// the value held by the boost variant in to type TargetType.
-//
-// This one is the default, which has no implementation.  We only have
-// specializations implement ConvertingVisitor, as we want to have very
-// fine-grained control of what each conversion does depending on the type.
-template <class TargetType>
-class ConvertingVisitor;
-
-template <>
-class ConvertingVisitor<std::string>
-  : public boost::static_visitor<std::string> {
- public:
-  std::string operator()(bool value) const;
-  std::string operator()(int32_t value) const;
-  std::string operator()(double value) const;
-  // In this case, we can just pass the same const-reference out, since it
-  // exists in the variant.  In all other cases, we have to copy because we are
-  // creating a std::string on the stack.
-  const std::string& operator()(const std::string& value) const;
-  std::string operator()(const SharedScriptingInterface& value) const;
-};
-
-template <>
-class ConvertingVisitor<SharedScriptingInterface >
-  : public boost::static_visitor<SharedScriptingInterface > {
- public:
-  template <class T>
-  SharedScriptingInterface operator()(T value) const {
-    // This is a catch all for types other than shared_ptr to
-    // ScriptingInterface, none of which can be converted to
-    // shared_ptr<ScriptingInterface>, so we just return a default-initialized
-    // shared_ptr.
-    return SharedScriptingInterface();
-  }
-  SharedScriptingInterface operator()(
-      const SharedScriptingInterface& value) const;
-};
-
-// This specialization handles getting a ScriptableNativeObject.  Currently, we
-// do NOT support converting to boost::shared_ptr<T> where T is a class which
-// inherits from ScriptableNativeObject.  To support it safely, we would require
-// a dynamic_cast to verify the type is correct, which would violate the Google
-// style guide by requiring RTTI.  To support it unsafely, we could static_cast,
-// but that would make strange failures happen if the user got it even slightly
-// wrong.  This forces them to get a SharedScriptableNativeObject and then do
-// the cast themselves, which at least puts any failures at the right place
-// (user code).
-template <>
-class ConvertingVisitor<SharedScriptableNativeObject>
-  : public boost::static_visitor<SharedScriptableNativeObject> {
- public:
-  template <class T>
-  SharedScriptableNativeObject operator()(T value) const {
-    // This is a catch all for types other than shared_ptr to
-    // ScriptingInterface, none of which can be converted to
-    // shared_ptr<ScriptingInterface>, so we just return a default-initialized
-    // shared_ptr.
-    return SharedScriptableNativeObject();
-  }
-  SharedScriptableNativeObject operator()(
-      const SharedScriptingInterface& value) const;
-};
-
-template <>
-class ConvertingVisitor<bool> : public boost::static_visitor<bool> {
- public:
-  bool operator()(bool value) const;
-  bool operator()(int32_t value) const;
-  bool operator()(double value) const;
-  bool operator()(const std::string& value) const;
-  bool operator()(const SharedScriptingInterface& value) const;
-};
-
-template <>
-class ConvertingVisitor<int32_t> : public boost::static_visitor<int32_t> {
- public:
-  int32_t operator()(bool value) const;
-  int32_t operator()(int32_t value) const;
-  int32_t operator()(double value) const;
-  int32_t operator()(const std::string& value) const;
-  int32_t operator()(const SharedScriptingInterface& value) const;
-};
-
-template <>
-class ConvertingVisitor<double> : public boost::static_visitor<double> {
- public:
-  double operator()(bool value) const;
-  double operator()(int32_t value) const;
-  double operator()(double value) const;
-  double operator()(const std::string& value) const;
-  double operator()(const SharedScriptingInterface& value) const;
-};
-
-}  // namespace c_salt
-
-#endif  // C_SALT_CONVERTING_VISITOR_H_