/usr/include/hphp/util/meta.h is in hhvm-dev 3.11.1+dfsg-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | /*
+----------------------------------------------------------------------+
| HipHop for PHP |
+----------------------------------------------------------------------+
| Copyright (c) 2010-2015 Facebook, Inc. (http://www.facebook.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
*/
#ifndef META_H_
#define META_H_
#include <type_traits>
namespace HPHP {
// is_const_iterator: by analogy with is_const et al.
template<typename Iter>
struct is_const_iterator {
using pointer = typename std::iterator_traits<Iter>::pointer;
using type = typename std::is_const<
typename std::remove_pointer<pointer>::type
>::type;
static bool constexpr value = type::value;
};
// match_iterator: return Value with the same const-ness as Iter.
template<typename Iter,
typename Value = typename std::iterator_traits<Iter>::type>
struct match_iterator : std::conditional<
is_const_iterator<Iter>::value,
std::add_const<Value>,
std::remove_const<Value>
>::type {};
// hphp_field_type: provide the type of a struct field.
#define hphp_field_type(strct, fld) decltype(((strct*)0)->fld)
}
#endif /* META_H_ */
|