找到Bug [英] Find The Bug
问题描述
我有这个代码：
#include< iostream>
使用命名空间std;
#define DeclareEnumTricks（T）\
inline T& operator ++（T& e）\
{\
e = T（e + 1）; \
返回e; \
} \
\
内联T运算符++（T& e，int）\
{\
T old = e; \
e = T（e + 1）; \
返回旧; \
} \
\
inline T&运营商 - （T& e）\
{\
e = T（e-1）; \
返回e; \
} \
\
内联T运算符 - （T& e，int）\
{\
T old = e; \
e = T（e-1）; \
返回旧; \
} \
\
内联T end（T）\
{\
返回T ## _ end; \
} \
\
内联T开始（T）\
{\
返回T ## _ begin; \
}
enum Piece {none，pawn，knight，bishop，rook，queen，king，
Piece_begin = pawn，Piece_end = king + 1};
DeclareEnumTricks（Piece）
int main（）
{
Piece p = none;
cout<< p << " " << p ++<< " " << ++ p<<结束;
}
g ++和其他几个编译器的输出是_not_
0 0 2
如预期。在g ++中它是
2 1 1
代码或编译器中是否有错误？
/ David
> cout<< p << " " << p ++<< " " << ++ p<< endl;代码或编译器中是否有错误？
在FAQ中。
Fao，Sean写道：cout<< p << " " << p ++<< " " << ++ p<< endl;
代码或编译器中是否有错误？
在FAQ中。
$ b $谢谢。我看了，但我找不到任何相关的东西。可以更多
具体吗？
/ David
" David Rasmussen" <哒************* @ gmx.net>在消息中写道
news：bu ********** @ news.net.uni-c.dk ...我有这段代码：
#include< iostream>
使用命名空间std;
#define DeclareEnumTricks（T）\
内联T& operator ++（T& e）\
{\
e = T（e + 1）; \
返回e;内联T算子++（T& e，int）\
{\
T old = e; \\ n \\ n \\ =
e = T（e + 1）; \
返回旧; \
} \
\
内联T&操作员 - （T& e）\
{\
e = T（e-1）; \
返回e;内联T算子 - （T& e，int）\
{\
T old = e; \\ n \\ n \\ =
e = T（e-1）; \ n>返回旧; \\ /
\\ /
内联T结尾（T）\
{\
返回T ## _ end;内联T开始（T）\
{\
返回T ## _开始; \
}
enum Piece {无，典当，骑士，主教，车，女王，国王，
Piece_begin = pawn，Piece_end = king + 1};
DeclareEnumTricks（Piece）
{p / none;
cout<< p << " " << p ++<< " " << ++ p<< endl;
}
g ++和其他几个编译器的输出是_not_
0 0 2
正如预期的那样。在g ++中它是
2 1 1
代码或编译器中是否有错误？
/ David
Comeau C ++提出了预期的输出：0 0 2
I have this code:
#include <iostream>
using namespace std;
#define DeclareEnumTricks(T) \
inline T& operator++(T& e) \
{ \
e = T(e+1); \
return e; \
} \
\
inline T operator++(T& e, int) \
{ \
T old = e; \
e = T(e+1); \
return old;\
} \
\
inline T& operator--(T& e) \
{ \
e = T(e-1); \
return e; \
} \
\
inline T operator--(T& e, int) \
{ \
T old = e; \
e = T(e-1); \
return old; \
} \
\
inline T end(T) \
{ \
return T##_end; \
} \
\
inline T begin(T) \
{ \
return T##_begin; \
}
enum Piece {none,pawn,knight,bishop,rook,queen,king,
Piece_begin = pawn, Piece_end = king + 1};
DeclareEnumTricks(Piece)
int main()
{
Piece p = none;
cout << p << " " << p++ << " " << ++p << endl;
}
The output from g++ and several other compilers is _not_
0 0 2
as expected. In g++ it is
2 1 1
Is there a bug in the code, or in the compilers?
/David
> cout << p << " " << p++ << " " << ++p << endl;Is there a bug in the code, or in the compilers?
In the FAQ.
Fao, Sean wrote:cout << p << " " << p++ << " " << ++p << endl;
Is there a bug in the code, or in the compilers?
In the FAQ.
Thanks. I''ve looked, but I can''t find anything relevant. Could be more
specific?
/David
"David Rasmussen" <da*************@gmx.net> wrote in message
news:bu**********@news.net.uni-c.dk...I have this code:
#include <iostream>
using namespace std;
#define DeclareEnumTricks(T) \
inline T& operator++(T& e) \
{ \
e = T(e+1); \
return e; \
} \
\
inline T operator++(T& e, int) \
{ \
T old = e; \
e = T(e+1); \
return old;\
} \
\
inline T& operator--(T& e) \
{ \
e = T(e-1); \
return e; \
} \
\
inline T operator--(T& e, int) \
{ \
T old = e; \
e = T(e-1); \
return old; \
} \
\
inline T end(T) \
{ \
return T##_end; \
} \
\
inline T begin(T) \
{ \
return T##_begin; \
}
enum Piece {none,pawn,knight,bishop,rook,queen,king,
Piece_begin = pawn, Piece_end = king + 1};
DeclareEnumTricks(Piece)
int main()
{
Piece p = none;
cout << p << " " << p++ << " " << ++p << endl;
}
The output from g++ and several other compilers is _not_
0 0 2
as expected. In g++ it is
2 1 1
Is there a bug in the code, or in the compilers?
/David
Comeau C++ came up with the expected output: 0 0 2
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