vsk added a subscriber: vsk.
vsk added a comment.

@Eugene.Zelenko thanks for pointing this out, I had totally missed this patch! 
Once we get this reviewed I'm willing to abandon my version. Some comments 
inline --


================
Comment at: clang-tidy/modernize/UseEmplaceCheck.cpp:26
@@ +25,3 @@
+  // + add handling of `push` for std::stack, std::queue, std::priority_queue
+  // + add handling of `insert` for stl associative container, but be cerfull
+  // because this requires special treatment (it could cause performance
----------------
cerfull -> careful

================
Comment at: clang-tidy/modernize/UseEmplaceCheck.cpp:37
@@ +36,3 @@
+
+  // We can't replace push_backs of smart pointer becase
+  // if emplacement will fail (f.e. bad_alloc in vector) we will have leak of
----------------
becase -> because

================
Comment at: test/clang-tidy/modernize-use-emplace.cpp:147
@@ +146,3 @@
+  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back {{..}}
+  // CHECK-FIXES: v.emplace_back(1, 2);
+  v.push_back(    S   {1, 2}    );
----------------
I don't think this is correct. Comments immediately before/after `S` or 
immediately before/after the second right parenthesis should be preserved. C.f 
the implementation in D21185.


http://reviews.llvm.org/D20964



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