libcxx initial import
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__sso_allocator b/include/__sso_allocator
new file mode 100644
index 0000000..6f5a75f
--- /dev/null
+++ b/include/__sso_allocator
@@ -0,0 +1,73 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___SSO_ALLOCATOR
+#define _LIBCPP___SSO_ALLOCATOR
+
+#include <__config>
+#include <type_traits>
+#include <new>
+
+#pragma GCC system_header
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp, size_t _N> class _LIBCPP_HIDDEN __sso_allocator;
+
+template <size_t _N>
+class _LIBCPP_HIDDEN __sso_allocator<void, _N>
+{
+public:
+ typedef const void* const_pointer;
+ typedef void value_type;
+};
+
+template <class _Tp, size_t _N>
+class _LIBCPP_HIDDEN __sso_allocator
+{
+ typename aligned_storage<sizeof(_Tp) * _N>::type buf_;
+ bool __allocated_;
+public:
+ typedef size_t size_type;
+ typedef _Tp* pointer;
+ typedef _Tp value_type;
+
+ _LIBCPP_INLINE_VISIBILITY __sso_allocator() throw() : __allocated_(false) {}
+ _LIBCPP_INLINE_VISIBILITY __sso_allocator(const __sso_allocator&) throw() : __allocated_(false) {}
+ template <class _Up> _LIBCPP_INLINE_VISIBILITY __sso_allocator(const __sso_allocator<_Up, _N>&) throw()
+ : __allocated_(false) {}
+private:
+ __sso_allocator& operator=(const __sso_allocator&);
+public:
+ _LIBCPP_INLINE_VISIBILITY pointer allocate(size_type __n, typename __sso_allocator<void, _N>::const_pointer = 0)
+ {
+ if (!__allocated_ && __n <= _N)
+ {
+ __allocated_ = true;
+ return (pointer)&buf_;
+ }
+ return static_cast<pointer>(::operator new(__n * sizeof(_Tp)));
+ }
+ _LIBCPP_INLINE_VISIBILITY void deallocate(pointer __p, size_type)
+ {
+ if (__p == (pointer)&buf_)
+ __allocated_ = false;
+ else
+ ::operator delete(__p);
+ }
+ _LIBCPP_INLINE_VISIBILITY size_type max_size() const throw() {return size_type(~0) / sizeof(_Tp);}
+
+ bool operator==(__sso_allocator& __a) const {return &buf_ == &__a.buf_;}
+ bool operator!=(__sso_allocator& __a) const {return &buf_ != &__a.buf_;}
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___SSO_ALLOCATOR