111 lines
3.8 KiB
C++
Executable file
111 lines
3.8 KiB
C++
Executable file
/*
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* Copyright (C) 2021 Duowan Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __X_PACK_TRAITS_H
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#define __X_PACK_TRAITS_H
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#if __GXX_EXPERIMENTAL_CXX0X__ || _MSC_VER>=1700
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#define X_PACK_SUPPORT_CXX0X 1
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#endif
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namespace xpack {
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// implement std::enable_if
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template<bool B, class T = void>
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struct x_enable_if {};
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template <class T>
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struct x_enable_if<true, T> { typedef T type; };
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// mark XPACK_OUT
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template <class T>
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struct is_xpack_out{static bool const value = false;};
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template <class T>
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struct is_xpack_xtype {static bool const value = false;};
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template <class CODER, class T>
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struct is_xpack_type_spec {static bool const value = false;};
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// for bitfield, declare raw type. thx https://stackoverflow.com/a/12199635/5845104
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template<int N> struct x_size { char value[N]; };
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x_size<1> x_decltype_encode(char);
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x_size<2> x_decltype_encode(signed char);
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x_size<3> x_decltype_encode(unsigned char);
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x_size<4> x_decltype_encode(short);
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x_size<5> x_decltype_encode(unsigned short);
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x_size<6> x_decltype_encode(int);
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x_size<7> x_decltype_encode(unsigned int);
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x_size<8> x_decltype_encode(long);
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x_size<9> x_decltype_encode(unsigned long);
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x_size<10> x_decltype_encode(long long);
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x_size<11> x_decltype_encode(unsigned long long);
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template<int N> struct x_decltype_decode {};
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template <> struct x_decltype_decode<1> {typedef char type;};
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template <> struct x_decltype_decode<2> {typedef signed char type;};
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template <> struct x_decltype_decode<3> {typedef unsigned char type;};
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template <> struct x_decltype_decode<4> {typedef short type;};
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template <> struct x_decltype_decode<5> {typedef unsigned short type;};
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template <> struct x_decltype_decode<6> {typedef int type;};
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template <> struct x_decltype_decode<7> {typedef unsigned int type;};
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template <> struct x_decltype_decode<8> {typedef long type;};
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template <> struct x_decltype_decode<9> {typedef unsigned long type;};
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template <> struct x_decltype_decode<10> {typedef long long type;};
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template <> struct x_decltype_decode<11> {typedef unsigned long long type;};
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class noncopyable {
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public:
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noncopyable(){}
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~noncopyable(){}
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private:
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noncopyable(const noncopyable&v);
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noncopyable& operator = (const noncopyable&v);
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};
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}
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#define x_pack_decltype(T) typename xpack::x_decltype_decode<sizeof(xpack::x_decltype_encode(T))>::type
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// fix SFINAE bug of vs2005, so vs2005(or pre version) not support XPACK_OUT define xtype.
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// can use custom
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// The priority of xtype is the highest
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#if defined _MSC_VER && _MSC_VER<=1400
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#define XPACK_IS_XTYPE(Coder, T) typename x_enable_if<is_xpack_xtype<T>::value && !is_xpack_type_spec<Coder, T>::value && !is_xpack_out<T>::value, bool>::type
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#else
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#define XPACK_IS_XTYPE(Coder, T) typename x_enable_if<is_xpack_xtype<T>::value && !is_xpack_type_spec<Coder, T>::value, bool>::type
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#endif
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/*
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struct A {
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XPACK(...);
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};
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struct B : public A{
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};
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XPACK_OUT(B, ...);
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in this case, B::__x_pack_value is true and should hit xpack_out, so
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XPACK_IS_XPACK need to add !is_xpack_out<T>::value
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*/
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#define XPACK_IS_XOUT(T) typename x_enable_if<is_xpack_out<T>::value && !is_xpack_xtype<T>::value, bool>::type
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#define XPACK_IS_XPACK(T) typename x_enable_if<T::__x_pack_value && !is_xpack_out<T>::value && !is_xpack_xtype<T>::value, bool>::type
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#endif
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