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Nim offsetof

Webb26 juni 2013 · 而__builtin_offsetof ()宏就是在编译器中已经设计好了的函数，直接调用即可。. 明白了这个区别后，下面的代码很好理解。. __compiler_offsetof来确认编译器中是否内建了功能同offsetof ()宏一样的宏。. 若已经内建了这样的宏，则 offsetof ()就是使用这个内建宏__compiler ... WebbNim är ett mycket gammalt sällskapsspel för två deltagare. I spelet använder man sig av exempelvis tändstickor (eller mynt eller små stenar), som läggs i ett valfritt antal högar (eller rader) med ett valfritt antal i varje hög. Spelarna turas sedan om att plocka bort en eller flera tändstickor från någon av högarna; det är ...

offsetof 和 container_of - william-cheung - 博客园

WebbSlutspelet i Nim lämnar lika många tändstickor i varje hög åt motspelaren. Till sist når man följande slutläge: Den som står i tur att dra har förlorat oavsett om man spelar Nim eller Omvänd Nim. Strategin för Nim och Omvänd Nim är densamma med följande undantag: När motspelaren efter sitt drag lämnar en Webb16 maj 2024 · I currently try to implement offsetof, alignof, sizeof as a compile time feature of my compiler ( #5664 ), and in my tests I found out, that the original nim code … play off final date https://creafleurs-latelier.com

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Webb9 maj 2014 · 在offsetof ()中，这个member成 员的地址实际上就是type数据结构中member成员相对于结构变量的偏移量。 对于给定一个结构，offsetof (type,member)是一个常 量，list_entry ()正是利用这个不变的偏移量来求得链表数据项的变量地址。 敬请高手指正。 plgxl 码龄11年 暂无认证 0 原创 158万+ 周排名 161万+ 总排名 1496 访问 等级 … Webb30 dec. 2008 · The purpose of a built-in __offsetof operator is that the compiler vendor can continue to #define an offsetof () macro, yet have it work with classes that define unary operator&. The typical C macro definition of offsetof () only worked when (&lvalue) returned the address of that rvalue. I.e. Webb27 nov. 2024 · C 库宏 offsetof (type, member-designator) 会生成一个类型为 size_t 的 整型 常量，它是一个结构成员相对于结构开头的字节偏移量。 成员是由 member-designator 给定的，结构的名称是在 type 中给定的。 /* * 参数： type -- 这是一个 class 类型，其中，member-designator 是一个有效的成员指示器。 * member-designator -- 这是一个 … playoff fantasy football rosters

offsetof - cppreference.com

Category:How to get the offset of a nested struct member in C?

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Nim offsetof

Linux 内核预备知识：浅析 offsetof 宏以及新手的所思所想 - 知乎

Webb28 juni 2010 · According to the 1998 ISO C++ standard, applying ‘offsetof’ to a non-POD type is undefined. In existing C++ implementations, however, ‘offsetof’ typically gives meaningful results even when applied to certain kinds of non-POD types. (Such as a simple ‘struct’ that fails to be a POD type only by virtue of having a constructor.) WebbNim är ett mycket gammalt sällskapsspel för två deltagare. I spelet använder man sig av exempelvis tändstickor (eller mynt eller små stenar), som läggs i ett valfritt antal högar …

Nim offsetof

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Webb24 maj 2024 · Can't use offsetOf on object that ends with an UncheckedArray · Issue #11320 · nim-lang/Nim · GitHub nim-lang Nim Sponsor Notifications Fork 1.4k Star 14.3k Pull requests Actions Wiki 1 Insights New issue Can't use offsetOf on object that ends with an UncheckedArray #11320 Closed MortimerSnerd opened this issue on May 24, 2024 … WebbExample template works(pos, member) = echo offsetof(type(pos[]), member) template broken[T](pos: ptr T, member) = echo offsetof(T, member) type O = object f: int var ...

WebbAttempting to use offsetOf on a type fails when used within a procedure inside a static block or assigned to a const. Example type GoodboySave = object checksum: uint32 header: array[8, char] versi... Webb8 jan. 2015 · offsetof (struct mystruct1, u_line.line); However, we can observe that the answer will be zero since mystruct1 contains a union as the first member (and only), …

http://ncm.gu.se/pdf/namnaren/4649_90_3-4.pdf Webb16 sep. 2024 · The compiler will generate a file named SourceFileName .s, and you can use -o Name to give it a different name if desired. Then grep "## offsetof" Name will find this line, showing something like: ## offsetof (struct A, b) = 1. Then you can use sed or other tools to extract the value.

Webb6 mars 2024 · template offsetof * (typ, field): expr = (var dummy: typ; cast [system. int](addr (dummy.field)) - cast [system. int](addr (dummy))) But I think it should be in the …

Webb23 okt. 2024 · I'm not entirely familiar with offsetof and what protobuf depends on them for. It looks like if there was a virtual table or something then offsetof doesn't calculate the correct offset for non-POD types perhaps? It just seems that if the compiler is saying the offsets are not valid, then it could be broken. playoff final tickets 2022Webb1 feb. 2024 · offsetof ()是一个宏 返回的是： 结构体成员 在内存中的偏移量。 #include #include struct S { char c1; int a; char c2; }; int main() { //offsetof ()返回 结构体成员 在内存中的偏移量 printf("%d\n", offsetof(struct S, c1));//0 printf("%d\n", offsetof(struct S, a));//4 printf("%d\n", offsetof(struct S, c2));//8 return 0; } … play-off finalsWebb先来看看offsetof宏是什么，这是定义在 中的一个宏，用来计算一个 struct 结构体中某个成员相对于结构体首地址的偏移量。 这是一个很有用的宏，因为 Linux … playoff fixtures nflWebb17 mars 2024 · How to get the offset of a nested struct member in C? One solution to print the offset of the checksum field in the info struct, is to use the macros typeof and … prime rate of borrowing historyWebb24 maj 2024 · It looks like system.offsetOf is instantiating the object as a var, and that's what's causing it to fail. Additional Information Nim Compiler Version 0.19.9 [Linux: … prime rate of canada historyWebboffsetof 是定义在头文件 stddef.h (cstddef in C++) 中的一个宏， 用于计算结构体 (struct)或联合体 (union) 成员的地址偏移。. 这一实现的原理是如果一个对象的地址为0的话，那么它的数据成员的地址就是数据成员在该对象的内存布局中相对于对象地址的偏移值。. 虽然这 ... playoff fantasy football strategyWebboffsetof对那些搞 C++ 的人可能很熟悉，因为offsetof类似于sizeof，也是一种系统操作符，你不用考虑它是怎么定义的。这个操作符offsetof的定义可以在 ANSI C 编译器所带的stddef.h中找到。在嵌入式系统里，不同开发商，不同架构处理器和编译器都有不同的offsetof定义形式: play off final tickets 2016