Comparison and streaming operators for base::Version

base/version.h

Index: base/version.h
diff --git a/base/version.h b/base/version.h
index 85c99a355bdae61aa89144037430b44d34b2da3c..30cb735b16cf572e971c0b185ee486c649eea866 100644
--- a/base/version.h
+++ b/base/version.h
@@ -6,6 +6,8 @@
 #define BASE_VERSION_H_
 
 #include <stdint.h>
+
+#include <iosfwd>
 #include <string>
 #include <vector>
 
@@ -37,14 +39,6 @@ class BASE_EXPORT Version {
   // Version behavior (IsValid) if no wildcard is present.
   static bool IsValidWildcardString(const std::string& wildcard_string);
 
-  // Commonly used pattern. Given a valid version object, compare if a
-  // |version_str| results in a newer version. Returns true if the
-  // string represents valid version and if the version is greater than
-  // than the version of this object.
-  bool IsOlderThan(const std::string& version_str) const;
-
-  bool Equals(const Version& other) const;
-
   // Returns -1, 0, 1 for <, ==, >.
   int CompareTo(const Version& other) const;
 
@@ -63,6 +57,14 @@ class BASE_EXPORT Version {
   std::vector<uint32_t> components_;
 };
 
+BASE_EXPORT bool operator==(const Version& v1, const Version& v2);
+BASE_EXPORT bool operator!=(const Version& v1, const Version& v2);
+BASE_EXPORT bool operator<(const Version& v1, const Version& v2);
+BASE_EXPORT bool operator<=(const Version& v1, const Version& v2);
+BASE_EXPORT bool operator>(const Version& v1, const Version& v2);
+BASE_EXPORT bool operator>=(const Version& v1, const Version& v2);
+BASE_EXPORT std::ostream& operator<<(std::ostream& stream, const Version& v);
+
 }  // namespace base
 
 // TODO(xhwang) remove this when all users are updated to explicitly use the