Apply clang-format to folly/gen/ (partial: namespace)

Summary:
[Folly] Apply `clang-format` to `folly/gen/` (partial: namespace).

With some manual rearrangement in the places where `clang-format` does awkward things, with the result that clang-format over `folly/gen/` becomes a no-op.

Reviewed By: Orvid

Differential Revision: D5177428

fbshipit-source-id: 17f51d00454a7be7f29dcf1a2ff3d0eaf1de72ab

folly/gen/Base-inl.h

@@ -22,7 +22,8 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wshadow"
 
-namespace folly { namespace gen {
+namespace folly {
+namespace gen {
 
 /**
  * ArgumentReference - For determining ideal argument type to receive a value.
@@ -2336,7 +2337,7 @@ inline detail::Skip skip(size_t count) { return detail::Skip(count); }
 inline detail::Batch batch(size_t batchSize) {
   return detail::Batch(batchSize);
 }
-
-}} // folly::gen
+} // gen
+} // folly
 
 #pragma GCC diagnostic pop

folly/gen/Base.h

@@ -78,9 +78,10 @@
  *
  * To learn more about this library, including the use of infinite generators,
  * see the examples in the comments, or the docs (coming soon).
-*/
+ */
 
-namespace folly { namespace gen {
+namespace folly {
+namespace gen {
 
 class Less {
 public:
@@ -814,7 +815,7 @@ template<class Fallback,
 UnwrapOr unwrapOr(Fallback&& fallback) {
   return UnwrapOr(std::forward<Fallback>(fallback));
 }
-
-}} // folly::gen
+} // gen
+} // folly
 
 #include <folly/gen/Base-inl.h>

folly/gen/Core-inl.h

@@ -25,7 +25,8 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wshadow"
 
-namespace folly { namespace gen {
+namespace folly {
+namespace gen {
 
 /**
  * IsCompatibleSignature - Trait type for testing whether a given Functor
@@ -372,7 +373,7 @@ public:
 };
 
 } // detail
-
-}} // folly::gen
+} // gen
+} // folly
 
 #pragma GCC diagnostic pop

folly/gen/Core.h

@@ -17,7 +17,8 @@
 #pragma once
 #define FOLLY_GEN_CORE_H_
 
-namespace folly { namespace gen {
+namespace folly {
+namespace gen {
 
 template<class Value, class Self>
 class GenImpl;
@@ -37,7 +38,7 @@ template<class Value, class First, class Second>
 class Chain;
 
 } // detail
-
-}} // folly::gen
+} // gen
+} // folly
 
 #include <folly/gen/Core-inl.h>

folly/gen/File-inl.h

@@ -161,4 +161,5 @@ inline auto byLine(int fd, char delim = '\n')
 
 inline auto byLine(const char* f, char delim = '\n')
   -> decltype(byLine(File(f), delim)) { return byLine(File(f), delim); }
-}}  // !folly::gen
+} // !gen
+} // !folly

folly/gen/File.h

@@ -64,7 +64,7 @@ template <class S = detail::FileWriter>
 S toFile(File file, std::unique_ptr<IOBuf> buffer) {
   return S(std::move(file), std::move(buffer));
 }
-
-}}  // !folly::gen
+} // !gen
+} // !folly
 
 #include <folly/gen/File-inl.h>

folly/gen/Parallel.h

@@ -21,7 +21,8 @@
 
 #include <folly/gen/Base.h>
 
-namespace folly { namespace gen {
+namespace folly {
+namespace gen {
 namespace detail {
 
 template <class Ops>
@@ -102,7 +103,7 @@ template <class Sink, class Sub = detail::Sub<Sink>>
 Sub sub(Sink sink) {
   return Sub(std::move(sink));
 }
-
-}} // !namespace folly::gen
+} // !namespace gen
+} // !namespace folly
 
 #include <folly/gen/Parallel-inl.h>

folly/gen/ParallelMap-inl.h

@@ -28,7 +28,9 @@
 #include <folly/MPMCPipeline.h>
 #include <folly/experimental/EventCount.h>
 
-namespace folly { namespace gen { namespace detail {
+namespace folly {
+namespace gen {
+namespace detail {
 
 /**
  * PMap - Map in parallel (using threads). For producing a sequence of
@@ -250,5 +252,6 @@ class PMap : public Operator<PMap<Predicate>> {
     return Gen(source.self(), pred_, nThreads_);
   }
 };
-
-}}}  // namespaces
+} // namespace detail
+} // namespace gen
+} // namespace folly

folly/gen/ParallelMap.h

@@ -19,7 +19,8 @@
 
 #include <folly/gen/Core.h>
 
-namespace folly { namespace gen {
+namespace folly {
+namespace gen {
 
 namespace detail {
 
@@ -42,7 +43,7 @@ template<class Predicate,
   PMap pmap(Predicate pred = Predicate(), size_t nThreads = 0) {
   return PMap(std::move(pred), nThreads);
 }
-
-}}  // namespaces
+} // namespace gen
+} // namespace folly
 
 #include <folly/gen/ParallelMap-inl.h>