Improve singleton example by assuming implementation is outside base/

base/memory/singleton.h

Index: base/memory/singleton.h
diff --git a/base/memory/singleton.h b/base/memory/singleton.h
index cfdff7831f9f7b5a4ad1be5aa955f33d73112641..5c58d5fe2944cd332980fb39f5dc5e815a48c0d4 100644
--- a/base/memory/singleton.h
+++ b/base/memory/singleton.h
@@ -153,14 +153,17 @@ subtle::Atomic32 StaticMemorySingletonTraits<Type>::dead_ = 0;
 // Example usage:
 //
 // In your header:
-//   template <typename T> struct DefaultSingletonTraits;
+//   namespace base {
+//   template <typename T>

[danakj, 2017/03/09 21:18:22]

nit: keep this as one line

[Patrick Monette, 2017/03/09 23:02:13]

That's how "git cl format" does it. IMO this example should show how
it will look after the formatting.

[danakj, 2017/03/09 23:04:18]

Ah, fair enough.

+//   struct DefaultSingletonTraits;
+//   }
 //   class FooClass {
 //    public:
 //     static FooClass* GetInstance();  <-- See comment below on this.
 //     void Bar() { ... }
 //    private:
 //     FooClass() { ... }
-//     friend struct DefaultSingletonTraits<FooClass>;
+//     friend struct base::DefaultSingletonTraits<FooClass>;
 //
 //     DISALLOW_COPY_AND_ASSIGN(FooClass);
 //   };
@@ -168,7 +171,14 @@ subtle::Atomic32 StaticMemorySingletonTraits<Type>::dead_ = 0;
 // In your source file:
 //  #include "base/memory/singleton.h"
 //  FooClass* FooClass::GetInstance() {
-//    return Singleton<FooClass>::get();
+//    return base::Singleton<FooClass>::get();
+//  }
+//
+// Or for leaky singletons:
+//  #include "base/memory/singleton.h"
+//  FooClass* FooClass::GetInstance() {
+//    return base::Singleton<
+//        FooClass, base::LeakySingletonTraits<FooClass>>::get();
 //  }
 //
 // And to call methods on FooClass: