mirror of
https://git.wownero.com/wownero/wownero.git
synced 2024-12-24 13:28:51 +00:00
182 lines
6.4 KiB
C++
182 lines
6.4 KiB
C++
// Tencent is pleased to support the open source community by making RapidJSON available.
|
|
//
|
|
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
|
|
//
|
|
// Licensed under the MIT License (the "License"); you may not use this file except
|
|
// in compliance with the License. You may obtain a copy of the License at
|
|
//
|
|
// http://opensource.org/licenses/MIT
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software distributed
|
|
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
|
|
// specific language governing permissions and limitations under the License.
|
|
|
|
#ifndef RAPIDJSON_INTERNAL_META_H_
|
|
#define RAPIDJSON_INTERNAL_META_H_
|
|
|
|
#include "../rapidjson.h"
|
|
|
|
#ifdef __GNUC__
|
|
RAPIDJSON_DIAG_PUSH
|
|
RAPIDJSON_DIAG_OFF(effc++)
|
|
#endif
|
|
#if defined(_MSC_VER)
|
|
RAPIDJSON_DIAG_PUSH
|
|
RAPIDJSON_DIAG_OFF(6334)
|
|
#endif
|
|
|
|
#if RAPIDJSON_HAS_CXX11_TYPETRAITS
|
|
#include <type_traits>
|
|
#endif
|
|
|
|
//@cond RAPIDJSON_INTERNAL
|
|
RAPIDJSON_NAMESPACE_BEGIN
|
|
namespace internal {
|
|
|
|
// Helper to wrap/convert arbitrary types to void, useful for arbitrary type matching
|
|
template <typename T> struct Void { typedef void Type; };
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// BoolType, TrueType, FalseType
|
|
//
|
|
template <bool Cond> struct BoolType {
|
|
static const bool Value = Cond;
|
|
typedef BoolType Type;
|
|
};
|
|
typedef BoolType<true> TrueType;
|
|
typedef BoolType<false> FalseType;
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// SelectIf, BoolExpr, NotExpr, AndExpr, OrExpr
|
|
//
|
|
|
|
template <bool C> struct SelectIfImpl { template <typename T1, typename T2> struct Apply { typedef T1 Type; }; };
|
|
template <> struct SelectIfImpl<false> { template <typename T1, typename T2> struct Apply { typedef T2 Type; }; };
|
|
template <bool C, typename T1, typename T2> struct SelectIfCond : SelectIfImpl<C>::template Apply<T1,T2> {};
|
|
template <typename C, typename T1, typename T2> struct SelectIf : SelectIfCond<C::Value, T1, T2> {};
|
|
|
|
template <bool Cond1, bool Cond2> struct AndExprCond : FalseType {};
|
|
template <> struct AndExprCond<true, true> : TrueType {};
|
|
template <bool Cond1, bool Cond2> struct OrExprCond : TrueType {};
|
|
template <> struct OrExprCond<false, false> : FalseType {};
|
|
|
|
template <typename C> struct BoolExpr : SelectIf<C,TrueType,FalseType>::Type {};
|
|
template <typename C> struct NotExpr : SelectIf<C,FalseType,TrueType>::Type {};
|
|
template <typename C1, typename C2> struct AndExpr : AndExprCond<C1::Value, C2::Value>::Type {};
|
|
template <typename C1, typename C2> struct OrExpr : OrExprCond<C1::Value, C2::Value>::Type {};
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// AddConst, MaybeAddConst, RemoveConst
|
|
template <typename T> struct AddConst { typedef const T Type; };
|
|
template <bool Constify, typename T> struct MaybeAddConst : SelectIfCond<Constify, const T, T> {};
|
|
template <typename T> struct RemoveConst { typedef T Type; };
|
|
template <typename T> struct RemoveConst<const T> { typedef T Type; };
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// IsSame, IsConst, IsMoreConst, IsPointer
|
|
//
|
|
template <typename T, typename U> struct IsSame : FalseType {};
|
|
template <typename T> struct IsSame<T, T> : TrueType {};
|
|
|
|
template <typename T> struct IsConst : FalseType {};
|
|
template <typename T> struct IsConst<const T> : TrueType {};
|
|
|
|
template <typename CT, typename T>
|
|
struct IsMoreConst
|
|
: AndExpr<IsSame<typename RemoveConst<CT>::Type, typename RemoveConst<T>::Type>,
|
|
BoolType<IsConst<CT>::Value >= IsConst<T>::Value> >::Type {};
|
|
|
|
template <typename T> struct IsPointer : FalseType {};
|
|
template <typename T> struct IsPointer<T*> : TrueType {};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// IsBaseOf
|
|
//
|
|
#if RAPIDJSON_HAS_CXX11_TYPETRAITS
|
|
|
|
template <typename B, typename D> struct IsBaseOf
|
|
: BoolType< ::std::is_base_of<B,D>::value> {};
|
|
|
|
#else // simplified version adopted from Boost
|
|
|
|
template<typename B, typename D> struct IsBaseOfImpl {
|
|
RAPIDJSON_STATIC_ASSERT(sizeof(B) != 0);
|
|
RAPIDJSON_STATIC_ASSERT(sizeof(D) != 0);
|
|
|
|
typedef char (&Yes)[1];
|
|
typedef char (&No) [2];
|
|
|
|
template <typename T>
|
|
static Yes Check(const D*, T);
|
|
static No Check(const B*, int);
|
|
|
|
struct Host {
|
|
operator const B*() const;
|
|
operator const D*();
|
|
};
|
|
|
|
enum { Value = (sizeof(Check(Host(), 0)) == sizeof(Yes)) };
|
|
};
|
|
|
|
template <typename B, typename D> struct IsBaseOf
|
|
: OrExpr<IsSame<B, D>, BoolExpr<IsBaseOfImpl<B, D> > >::Type {};
|
|
|
|
#endif // RAPIDJSON_HAS_CXX11_TYPETRAITS
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
// EnableIf / DisableIf
|
|
//
|
|
template <bool Condition, typename T = void> struct EnableIfCond { typedef T Type; };
|
|
template <typename T> struct EnableIfCond<false, T> { /* empty */ };
|
|
|
|
template <bool Condition, typename T = void> struct DisableIfCond { typedef T Type; };
|
|
template <typename T> struct DisableIfCond<true, T> { /* empty */ };
|
|
|
|
template <typename Condition, typename T = void>
|
|
struct EnableIf : EnableIfCond<Condition::Value, T> {};
|
|
|
|
template <typename Condition, typename T = void>
|
|
struct DisableIf : DisableIfCond<Condition::Value, T> {};
|
|
|
|
// SFINAE helpers
|
|
struct SfinaeTag {};
|
|
template <typename T> struct RemoveSfinaeTag;
|
|
template <typename T> struct RemoveSfinaeTag<SfinaeTag&(*)(T)> { typedef T Type; };
|
|
|
|
#define RAPIDJSON_REMOVEFPTR_(type) \
|
|
typename ::RAPIDJSON_NAMESPACE::internal::RemoveSfinaeTag \
|
|
< ::RAPIDJSON_NAMESPACE::internal::SfinaeTag&(*) type>::Type
|
|
|
|
#define RAPIDJSON_ENABLEIF(cond) \
|
|
typename ::RAPIDJSON_NAMESPACE::internal::EnableIf \
|
|
<RAPIDJSON_REMOVEFPTR_(cond)>::Type * = NULL
|
|
|
|
#define RAPIDJSON_DISABLEIF(cond) \
|
|
typename ::RAPIDJSON_NAMESPACE::internal::DisableIf \
|
|
<RAPIDJSON_REMOVEFPTR_(cond)>::Type * = NULL
|
|
|
|
#define RAPIDJSON_ENABLEIF_RETURN(cond,returntype) \
|
|
typename ::RAPIDJSON_NAMESPACE::internal::EnableIf \
|
|
<RAPIDJSON_REMOVEFPTR_(cond), \
|
|
RAPIDJSON_REMOVEFPTR_(returntype)>::Type
|
|
|
|
#define RAPIDJSON_DISABLEIF_RETURN(cond,returntype) \
|
|
typename ::RAPIDJSON_NAMESPACE::internal::DisableIf \
|
|
<RAPIDJSON_REMOVEFPTR_(cond), \
|
|
RAPIDJSON_REMOVEFPTR_(returntype)>::Type
|
|
|
|
} // namespace internal
|
|
RAPIDJSON_NAMESPACE_END
|
|
//@endcond
|
|
|
|
#if defined(__GNUC__) || defined(_MSC_VER)
|
|
RAPIDJSON_DIAG_POP
|
|
#endif
|
|
|
|
#endif // RAPIDJSON_INTERNAL_META_H_
|