leveldb: Require C++11.

This CL switches the public headers to C++11 default and deleted constructors, and adds override to the relevant leveldb::EnvWrapper methods. This should be a good test for C++11 compiler support.

Once this CL settles, the rest of the codebase can be safely modernized to C++11.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189873212

1 files changed, 4 insertions, 2 deletions

diff --git a/include/leveldb/slice.h b/include/leveldb/slice.h
index b56a4e4..a86e8a6 100644
--- a/include/leveldb/slice.h
+++ b/include/leveldb/slice.h
@@ -37,6 +37,10 @@ class LEVELDB_EXPORT Slice {
   // Create a slice that refers to s[0,strlen(s)-1]
   Slice(const char* s) : data_(s), size_(strlen(s)) { }
 
+  // Intentionally copyable.
+  Slice(const Slice&) = default;
+  Slice& operator=(const Slice&) = default;
+
   // Return a pointer to the beginning of the referenced data
   const char* data() const { return data_; }
 
@@ -81,8 +85,6 @@ class LEVELDB_EXPORT Slice {
  private:
   const char* data_;
   size_t size_;
-
-  // Intentionally copyable
 };
 
 inline bool operator==(const Slice& x, const Slice& y) {