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Nim offsetof

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 … Webb19 okt. 2024 · My desired usecase is actually more complex I'm trying to get offsetOf (Foo, bars [4].blop) so ideally offsetOf would support returning the offset of any child of any base. type Bar = object bop: uint8 blop: uint8 type Foo = object baz: uint8 bars: array [ 4, Bar ] bar: Bar var foo: Foo let offset = ( cast [ int ] ( addr (foo. bars [ 3 ].blop ...

How can I print the offset of a struct member at compile time?

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... Webb1 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; } … cover for humminbird helix 7 https://tgscorp.net

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

Webb18 feb. 2024 · The offset of the first member of a standard-layout type is always zero ( empty-base optimization is mandatory). (since C++11) offsetof cannot be implemented … 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. 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 … brick cars wiki

offsetof - 維基百科，自由的百科全書

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Nim offsetof

offsetof - cppreference.com

WebbC's offsetof() macro is an ANSI C library feature found in stddef.h. It evaluates to the offset (in bytes) of a given member within a struct or union type, an expression of type size_t . … 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 …

Nim offsetof

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Webboffsetof (s,m)解析. (s *)0 是把0地址转换为s指针类型，然后从这个指针上“取”m成员再取址，而m成员的地址转换后结果就是m成员相对于整个对象的偏移量（我们既然是从0地址开始算的，就不用再减去起始地址0）。. 在嵌入式应用中，或许你对offsetof接触不多甚至 ... Webb16 juli 2011 · offsetof ( type, member-designator) which expands to an integral constant expression that has type size_t, the value of which is the offset in bytes, to the structure member (designated by member-designator ), from the beginning of its structure (designated by type ). Using the offsetof macro does not invoke undefined behavior.

http://ncm.gu.se/pdf/namnaren/4649_90_3-4.pdf Webb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 …

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 jan. 2013 · #define OFFSET (x) offsetof (struct {\ char param1 [1], param2 [2], param3 [4], param4 [1];\ },x) Then you can use OFFSET (param1), etc. and it's even an integer …

Webb24 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: …

Webboffsetof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: brick carvingWebbExample 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 ... cover for immersion heaterWebb28 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.) brickcasey10WebbNim 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 ... cover for husqvarna lawn tractorWebb9 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 … brick cars \u0026 trucksWebb18 feb. 2024 · It is specified in C23 that defining a new type in offsetof is undefined behavior, and such usage is only partially supported by some implementations in C++ modes: offsetof(struct Foo { int a; }, a) is supported by ICC and some old versions of GCC, while offsetof(struct Foo { int a, b; }, a) is rejected by all known implementations … brick cartoon pngWebbPrint offsets of object field in Nim. GitHub Gist: instantly share code, notes, and snippets. Skip to content. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} … brick cartridge