/*
- * Copyright 2015 Facebook, Inc.
+ * Copyright 2016 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
// @author: Andrei Alexandrescu
-#ifndef FOLLY_BASE_TRAITS_H_
-#define FOLLY_BASE_TRAITS_H_
+#pragma once
#include <memory>
#include <limits>
#endif
#include <boost/type_traits.hpp>
-#include <boost/mpl/and.hpp>
#include <boost/mpl/has_xxx.hpp>
-#include <boost/mpl/not.hpp>
namespace folly {
traits_detail::has_true_IsZeroInitializable<T>::value
> {};
+template <typename...>
+struct Conjunction : std::true_type {};
+template <typename T>
+struct Conjunction<T> : T {};
+template <typename T, typename... TList>
+struct Conjunction<T, TList...>
+ : std::conditional<T::value, Conjunction<TList...>, T>::type {};
+
+template <typename...>
+struct Disjunction : std::false_type {};
+template <typename T>
+struct Disjunction<T> : T {};
+template <typename T, typename... TList>
+struct Disjunction<T, TList...>
+ : std::conditional<T::value, T, Disjunction<TList...>>::type {};
+
+template <typename T>
+struct Negation : std::integral_constant<bool, !T::value> {};
+
} // namespace folly
/**
template <class T, class U>
struct pair;
#ifndef _GLIBCXX_USE_FB
+FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN
template <class T, class R, class A>
class basic_string;
+FOLLY_GLIBCXX_NAMESPACE_CXX11_END
#else
template <class T, class R, class A, class S>
class basic_string;
class vector;
template <class T, class A>
class deque;
+FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN
template <class T, class A>
class list;
+FOLLY_GLIBCXX_NAMESPACE_CXX11_END
template <class T, class C, class A>
class set;
template <class K, class V, class C, class A>
template <class T, class U>
struct has_nothrow_constructor< std::pair<T, U> >
- : ::boost::mpl::and_< has_nothrow_constructor<T>,
- has_nothrow_constructor<U> > {};
+ : std::integral_constant<bool,
+ has_nothrow_constructor<T>::value &&
+ has_nothrow_constructor<U>::value> {};
} // namespace boost
// STL commonly-used types
template <class T, class U>
-struct IsRelocatable< std::pair<T, U> >
- : ::boost::mpl::and_< IsRelocatable<T>, IsRelocatable<U> > {};
+struct IsRelocatable< std::pair<T, U> >
+ : std::integral_constant<bool,
+ IsRelocatable<T>::value &&
+ IsRelocatable<U>::value> {};
// Is T one of T1, T2, ..., Tn?
template <class T, class... Ts>
// folly::to integral specializations can end up generating code
// inside what are really static ifs (not executed because of the templated
-// types) that violate -Wsign-compare so suppress them in order to not prevent
-// all calling code from using it.
+// types) that violate -Wsign-compare and/or -Wbool-compare so suppress them
+// in order to not prevent all calling code from using it.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-compare"
+#if __GNUC_PREREQ(5, 0)
+#pragma GCC diagnostic ignored "-Wbool-compare"
+#endif
template <typename RHS, RHS rhs, typename LHS>
-bool less_than_impl(
- typename std::enable_if<
- (rhs <= std::numeric_limits<LHS>::max()
- && rhs > std::numeric_limits<LHS>::min()),
- LHS
- >::type const lhs
-) {
- return lhs < rhs;
-}
-
-template <typename RHS, RHS rhs, typename LHS>
-bool less_than_impl(
- typename std::enable_if<
- (rhs > std::numeric_limits<LHS>::max()),
- LHS
- >::type const
-) {
- return true;
+bool less_than_impl(LHS const lhs) {
+ return
+ rhs > std::numeric_limits<LHS>::max() ? true :
+ rhs <= std::numeric_limits<LHS>::min() ? false :
+ lhs < rhs;
}
template <typename RHS, RHS rhs, typename LHS>
-bool less_than_impl(
- typename std::enable_if<
- (rhs <= std::numeric_limits<LHS>::min()),
- LHS
- >::type const
-) {
- return false;
+bool greater_than_impl(LHS const lhs) {
+ return
+ rhs > std::numeric_limits<LHS>::max() ? false :
+ rhs < std::numeric_limits<LHS>::min() ? true :
+ lhs > rhs;
}
#pragma GCC diagnostic pop
-template <typename RHS, RHS rhs, typename LHS>
-bool greater_than_impl(
- typename std::enable_if<
- (rhs <= std::numeric_limits<LHS>::max()
- && rhs >= std::numeric_limits<LHS>::min()),
- LHS
- >::type const lhs
-) {
- return lhs > rhs;
-}
-
-template <typename RHS, RHS rhs, typename LHS>
-bool greater_than_impl(
- typename std::enable_if<
- (rhs > std::numeric_limits<LHS>::max()),
- LHS
- >::type const
-) {
- return false;
-}
-
-template <typename RHS, RHS rhs, typename LHS>
-bool greater_than_impl(
- typename std::enable_if<
- (rhs < std::numeric_limits<LHS>::min()),
- LHS
- >::type const
-) {
- return true;
-}
-
} // namespace detail {
// same as `x < 0`
>(lhs);
}
+/**
+ * Like std::piecewise_construct, a tag type & instance used for in-place
+ * construction of non-movable contained types, e.g. by Synchronized.
+ */
+struct construct_in_place_t {};
+constexpr construct_in_place_t construct_in_place{};
+
} // namespace folly
+// gcc-5.0 changed string's implementation in libgcc to be non-relocatable
+#if __GNUC__ < 5
FOLLY_ASSUME_FBVECTOR_COMPATIBLE_3(std::basic_string);
+#endif
FOLLY_ASSUME_FBVECTOR_COMPATIBLE_2(std::vector);
FOLLY_ASSUME_FBVECTOR_COMPATIBLE_2(std::list);
FOLLY_ASSUME_FBVECTOR_COMPATIBLE_2(std::deque);
classname, func_name, /* nolint */ volatile); \
FOLLY_CREATE_HAS_MEMBER_FN_TRAITS_IMPL( \
classname, func_name, /* nolint */ volatile const)
-
-#endif //FOLLY_BASE_TRAITS_H_