Rename IOBufEqual to IOBufEqualTo

Summary: [Folly] Rename `IOBufEqual` to `IOBufEqualTo` to correspond with the standard naming of `std::equal_to`.

Reviewed By: Orvid

Differential Revision: D7596716

fbshipit-source-id: 2e87aa4b62a002520bdd53b5b7eaba7d9bd822da

folly/io/IOBuf.cpp

@@ -1028,7 +1028,7 @@ size_t IOBufHash::operator()(const IOBuf& buf) const {
   return h1;
 }
 
-bool IOBufEqual::operator()(const IOBuf& a, const IOBuf& b) const {
+bool IOBufEqualTo::operator()(const IOBuf& a, const IOBuf& b) const {
   io::Cursor ca(&a);
   io::Cursor cb(&b);
   for (;;) {

folly/io/IOBuf.h

@@ -1424,7 +1424,7 @@ struct IOBufHash {
 /**
  * Equality predicate for IOBuf objects. Compares data in the entire chain.
  */
-struct IOBufEqual {
+struct IOBufEqualTo {
   bool operator()(const IOBuf& a, const IOBuf& b) const;
   bool operator()(const std::unique_ptr<IOBuf>& a,
                   const std::unique_ptr<IOBuf>& b) const {

folly/io/async/test/WriteChainAsyncTransportWrapperTest.cpp

@@ -48,7 +48,7 @@ class TestWriteChainAsyncTransportWrapper :
 };
 
 MATCHER_P(BufMatches, expected, "") {
-  folly::IOBufEqual eq;
+  folly::IOBufEqualTo eq;
   return eq(*arg, *expected);
 }
 

folly/io/test/IOBufCursorTest.cpp

@@ -445,7 +445,7 @@ TEST(IOBuf, cloneAndInsert) {
 }
 
 TEST(IOBuf, cloneWithEmptyBufAtStart) {
-  folly::IOBufEqual eq;
+  folly::IOBufEqualTo eq;
   auto empty = IOBuf::create(0);
   auto hel = IOBuf::create(3);
   append(hel, "hel");

folly/io/test/IOBufTest.cpp

@@ -1044,7 +1044,7 @@ std::unique_ptr<IOBuf> fromStr(StringPiece sp) {
 } // namespace
 
 TEST(IOBuf, HashAndEqual) {
-  folly::IOBufEqual eq;
+  folly::IOBufEqualTo eq;
   folly::IOBufHash hash;
 
   EXPECT_TRUE(eq(nullptr, nullptr));