#include <bits/c++config.h>
-_GLIBCXX_BEGIN_NAMESPACE(std)
+namespace std
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
// Hash function implementation for the nontrivial specialization.
// All of them are based on a primitive that hashes a pointer to a
size_t
_Fnv_hash_bytes(const void* __ptr, size_t __len, size_t __seed);
-_GLIBCXX_END_NAMESPACE
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
#endif