base::mac::IsOSSierra() -> base::mac::IsOS10_12(), etc.

base/mac/mac_util.h

 // Copyright (c) 2012 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 BASE_MAC_MAC_UTIL_H_
 #define BASE_MAC_MAC_UTIL_H_
 
 #include <AvailabilityMacros.h>
 #include <Carbon/Carbon.h>
 #include <stdint.h>
@@ skipping 90 matching lines @@
 BASE_EXPORT bool WasLaunchedAsLoginItemRestoreState();
 
 // Returns true if the current process was automatically launched as a
 // 'Login Item' with 'hide on startup' flag. Used to suppress opening windows.
 BASE_EXPORT bool WasLaunchedAsHiddenLoginItem();
 
 // Remove the quarantine xattr from the given file. Returns false if there was
 // an error, or true otherwise.
 BASE_EXPORT bool RemoveQuarantineAttribute(const FilePath& file_path);
 
+namespace internal {
+
+// Returns the running system's Mac OS X minor version. This is the |y| value
+// in 10.y or 10.y.z.
+BASE_EXPORT int MacOSXMinorVersion();
+
+// Class to compare the running system's Mac OS X minor version with a known
+// one. When ID is a MAC_OS_X_VERSION_10_* macro from AvailabilityMacros.h,
+// some tests may compile to constants depending on deployment target
+// (-mmacosx-version-min). For instance, OSVersion<9>::IsAtLeast() is always
+// true with a deployment target of 10.10. ID can also be 0 to support an OS
+// version that's newer than the build SDK.
+template <int V, int ID>
+class OSVersion {
+ public:
+  static constexpr bool Equals() {
+    return !MinVersionIsGreater() && MacOSXMinorVersion() == V;
+  }
+
+  static constexpr bool IsAtLeast() {
+    return MinVersionIsGreater() || MacOSXMinorVersion() >= V;
+  }
+
+  static constexpr bool IsAtMost() {
+    return !MinVersionIsGreater() && MacOSXMinorVersion() <= V;
+  }
+
+ private:
+  // Is the minimum OS version greater than this one?
+  static constexpr bool MinVersionIsGreater() {

[Mark Mentovai, 2016/08/25 13:58:56]

DeploymentTargetIsGreater() or MinRuntimeVersionIsGreater()?

[Sidney San Martín, 2016/08/26 00:00:01]

I like DeploymentTargetIsGreater(), even though it's not called that on the
command line. Done.

+    return ID && MAC_OS_X_VERSION_MIN_REQUIRED > ID;
+  }
+};
+}

[Mark Mentovai, 2016/08/25 13:58:56]

//  namespace

[Sidney San Martín, 2016/08/26 00:00:01]

Done.

+
 // Run-time OS version checks. Use these instead of
-// base::SysInfo::OperatingSystemVersionNumbers. Prefer the "OrEarlier" and
-// "OrLater" variants to those that check for a specific version, unless you
+// base::SysInfo::OperatingSystemVersionNumbers. Prefer the "IsAtLeastOS" and
+// "IsAtMostOS" variants to those that check for a specific version, unless you
 // know for sure that you need to check for a specific version.
 
-// Mavericks is OS X 10.9, Darwin 13.
-BASE_EXPORT bool IsOSMavericks();
+#define DECLARE_IS_OS_FUNCS_ID(V, ID)                                   \
+  const auto IsOS10_##V = internal::OSVersion<V, ID>::Equals;           \
+  const auto IsAtLeastOS10_##V = internal::OSVersion<V, ID>::IsAtLeast; \
+  const auto IsAtMostOS10_##V = internal::OSVersion<V, ID>::IsAtMost;
 
-// Yosemite is OS X 10.10, Darwin 14.
-BASE_EXPORT bool IsOSYosemite();
-BASE_EXPORT bool IsOSYosemiteOrEarlier();
-BASE_EXPORT bool IsOSYosemiteOrLater();
+#define DECLARE_IS_OS_FUNCS(V) \
+  DECLARE_IS_OS_FUNCS_ID(V, MAC_OS_X_VERSION_10_##V)
 
-// El Capitan is OS X 10.11, Darwin 15.
-BASE_EXPORT bool IsOSElCapitan();
-BASE_EXPORT bool IsOSElCapitanOrEarlier();
-BASE_EXPORT bool IsOSElCapitanOrLater();
+DECLARE_IS_OS_FUNCS(9)
+DECLARE_IS_OS_FUNCS(10)
+DECLARE_IS_OS_FUNCS(11)
 
-// Sierra is macOS 10.12, Darwin 16.
-BASE_EXPORT bool IsOSSierra();
-BASE_EXPORT bool IsOSSierraOrLater();
+// Until we switch to an SDK that knows about 10.12.

[Mark Mentovai, 2016/08/25 13:58:56]

I don’t think that the SDK we use for official builds even knows about 10.11.

[Sidney San Martín, 2016/08/26 00:00:01]

Done, let me know if I overlooked a more obvious way of doing it.

+DECLARE_IS_OS_FUNCS_ID(12, 0)
+
+#undef DECLARE_IS_OS_FUNCS
+#undef DECLARE_IS_OS_FUNCS_ID
 
 // This should be infrequently used. It only makes sense to use this to avoid
 // codepaths that are very likely to break on future (unreleased, untested,
 // unborn) OS releases, or to log when the OS is newer than any known version.
-BASE_EXPORT bool IsOSLaterThanSierra_DontCallThis();
-
-// Inline functions that are redundant due to version ranges being mutually-
-// exclusive.
-inline bool IsOSYosemiteOrEarlier() { return !IsOSElCapitanOrLater(); }
-inline bool IsOSElCapitanOrEarlier() { return !IsOSSierraOrLater(); }
-
-// When the deployment target is set, the code produced cannot run on earlier
-// OS releases. That enables some of the IsOS* family to be implemented as
-// constant-value inline functions. The MAC_OS_X_VERSION_MIN_REQUIRED macro
-// contains the value of the deployment target.
-
-#if defined(MAC_OS_X_VERSION_10_9) && \
-    MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_9
-#define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_9
-inline bool IsOSMavericks() { return false; }
-#endif
-
-#if defined(MAC_OS_X_VERSION_10_10) && \
-    MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_10
-#define BASE_MAC_MAC_UTIL_H_INLINED_GE_10_10
-inline bool IsOSYosemiteOrLater() { return true; }
-#endif
-
-#if defined(MAC_OS_X_VERSION_10_10) && \
-    MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_10
-#define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_10
-inline bool IsOSYosemite() { return false; }
-#endif
-
-#if defined(MAC_OS_X_VERSION_10_11) && \
-    MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_11
-#define BASE_MAC_MAC_UTIL_H_INLINED_GE_10_11
-inline bool IsOSElCapitanOrLater() { return true; }
-#endif
-
-#if defined(MAC_OS_X_VERSION_10_11) && \
-    MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_11
-#define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_11
-inline bool IsOSElCapitan() { return false; }
-#endif
-
-#if defined(MAC_OS_X_VERSION_10_12) && \
-    MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12
-#define BASE_MAC_MAC_UTIL_H_INLINED_GE_10_12
-inline bool IsOSSierraOrLater() { return true; }
-#endif
-
-#if defined(MAC_OS_X_VERSION_10_12) && \
-    MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_12
-#define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_12
-inline bool IsOSSierra() { return false; }
-inline bool IsOSLaterThanSierra_DontCallThis() { return true; }
-#endif
+inline bool IsOSLaterThanSierra_DontCallThis() {

[Mark Mentovai, 2016/08/25 13:58:56]

Probaby should rename this IsLaterThanOS10_12_DontCallThis()

[Sidney San Martín, 2016/08/26 00:00:01]

Done, good catch :).

+  return !IsAtMostOS10_12();
+}
 
 // Retrieve the system's model identifier string from the IOKit registry:
 // for example, "MacPro4,1", "MacBookPro6,1". Returns empty string upon
 // failure.
 BASE_EXPORT std::string GetModelIdentifier();
 
 // Parse a model identifier string; for example, into ("MacBookPro", 6, 1).
 // If any error occurs, none of the input pointers are touched.
 BASE_EXPORT bool ParseModelIdentifier(const std::string& ident,
                                       std::string* type,
                                       int32_t* major,
                                       int32_t* minor);
 
 }  // namespace mac
 }  // namespace base
 
 #endif  // BASE_MAC_MAC_UTIL_H_