unspecified-behavior

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Should an empty base class affect the layout of the derived class?

The C++ standard (quoting from draft n3242) says the following about subobjects [intro.object]: Unless an object is a bit-field or a base class subobject of zero[详细]

2023-04-12 17:13 分类：问答
Reason for Scala's Map.unzip returning (Iterable, Iterable)

the other day I was wondering why scala.collection.Map defines its unzip method as def unzip [A1, A2] (implicit asPair: ((A, B)) ⇒ (A1, A2)): (Iterable[A1], Iterable[A2])[详细]

2023-02-20 20:53 分类：问答
Is it unspecified behavior to compare pointers to different arrays for equality?

The equality operators have the semantic restrictions of relational operators on pointers: The == (equal to) and the != (not equal to) operators have the same semantic restrictions, conversions, and[详细]

2023-02-09 00:05 分类：问答
Neither of undefined, implementation defined, unspecifed behavior

C++03 $5.3.3/2 - \"The size of a most derived class shall be greater than zero (1.8).\" $1.8/4 - \"Unless it is a bit-field[详细]

2023-01-29 06:54 分类：问答
Is there any tool for C++ which will check for common unspecified behavior?

Often one makes assumptions about a particular platform one is coding on, for example that signed integers use two\'s complement storage, or that (开发者_如何学Python0xFFFFFFFF == -1), or things of th[详细]

2023-01-27 05:55 分类：问答
How to implement memmove in standard C without an intermediate copy?

From the man page on my system: void *memmove(void *dst, const void *src, size_t len); DESCRIPTION The memmove() function copies len bytes from string src to string dst.[详细]

2023-01-22 05:17 分类：问答
Undefined, unspecified and implementation-defined behavior

What is undefined behavior (UB) in C and C++?What about unspecified behavior and implementa开发者_如何学运维tion-defined behavior?What is the difference between them?Undefined behavior is one of those[详细]

2022-12-22 00:29 分类：问答