[chromium-reviews] Add Compact Language Detection (CLD) library to Chrome. This works in Windows...

third_party/cld/bar/common/scopedlibrary.h

Index: third_party/cld/bar/common/scopedlibrary.h
===================================================================
--- third_party/cld/bar/common/scopedlibrary.h	(revision 0)
+++ third_party/cld/bar/common/scopedlibrary.h	(revision 0)
@@ -0,0 +1,68 @@
+// Copyright (c) 2006-2009 The Chromium 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 BAR_COMMON_SCOPEDLIBRARY_H_
+#define BAR_COMMON_SCOPEDLIBRARY_H_
+
+
+// A scoped object to safely load and free a DLL referenced by name.
+// Provides an access to a handle to loaded library (HMODULE type).
+//
+// Example:
+//     ScopedLibrary library(LIBRARY_NAME);
+//     ... = ::GetProcAddress(library.handle(), FUNCTION_NAME);
+class ScopedLibrary {
+ public:
+  // Always creates initialized ScopedLibrary.
+  // [in] file_name - library's file name.
+  explicit ScopedLibrary(const TCHAR *file_name)
+      : library_(::LoadLibrary(file_name)) {}
+  // Unloads owned library, if any.
+  ~ScopedLibrary() {
+    if (library_ != NULL)
+      ::FreeLibrary(library_);
+  }
+  inline HMODULE handle() const { return library_; }
+  // Returns true if library was loaded successfully.
+  bool IsValid() const { return library_ != NULL; }
+
+ private:
+  // Handle to loaded library.
+  const HMODULE library_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedLibrary);
+};
+
+
+// A class representing a pointer to a function retrieved from DLL.
+// FunctionPrototype is a regular C-style pointer-to-function type
+// definition. For example, type of WinAPI IsValidSid function:
+//     BOOL (WINAPI*)(PSID)
+//
+// Example:
+//     FunctionFromDll<BOOL (WINAPI*)(PSID)> is_valid_sid;
+//     ... = is_valid_sid.function()(...);
+template<typename FunctionPrototype>
+class FunctionFromDll {
+ public:
+  FunctionFromDll() : function_(NULL) {}
+  // Binds this object to a function from DLL.
+  // [in] library - handle to a library containing a function.
+  //     Must not be NULL.
+  // [in] name - name of the function.
+  void Bind(HMODULE library, const char *name) {
+    function_ =
+        reinterpret_cast<FunctionPrototype>(::GetProcAddress(library, name));
+  }
+  inline FunctionPrototype function() const { return function_; }
+  // Returns true if function was bound successfully.
+  bool IsValid() const { return function_ != NULL; }
+
+ private:
+  // Pointer to the function.
+  FunctionPrototype function_;
+  DISALLOW_COPY_AND_ASSIGN(FunctionFromDll);
+};
+
+
+#endif  // BAR_COMMON_SCOPEDLIBRARY_H_
Property changes on: third_party\cld\bar\common\scopedlibrary.h
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Added: svn:eol-style
   + LF