2024 Nim offsetof

Nim offsetof

Author: lfjd

August undefined, 2024

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. 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), …

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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 … WebbSe nationella informationsmängder initierade av nationella gemensamma uppdrag/projekt här. Hälso- och sjukvård. Socialtjänst. Namn. Version. Status. Format. danefield terrace liverpool

C 库宏 – offsetof() 菜鸟教程

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 … WebbThe macro offsetof () returns the offset of the field member from the start of the structure type . This macro is useful because the sizes of the fields that compose a structure can vary across implementations, and compilers may insert different numbers of … 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 ... danefield cattery

c - How do you use offsetof() on a struct? - Stack Overflow

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 … 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 … danefield play areaWebb24 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: … birmingham fire doors

"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; } … " - Nim offsetof

Nim offsetof

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 ... 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 …

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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 Webb18 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 …

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. WebbThe compiler depends on the System module to work properly and the System module depends on the compiler. Most of the routines listed here use special compiler magic. …

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. 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 …

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 …

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 ... birmingham fire department stationsWebbC'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 . … danefield road northwichWebboffsetof (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 ... dane fife todayWebbC 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。声明下面是 offsetof () 宏的声明。 offsetof(type, member-designator) 参数 type -- 这是一个 class 类型，其中，member-designator 是一个有效的 … birmingham fire football teamWebbGolang Offsetof - 30 examples found. These are the top rated real world Golang examples of unsafe.Offsetof extracted from open source projects. You can rate examples to help us improve the quality of examples. Programming Language: Golang Namespace/Package Name: unsafe Method/Function: Offsetof Examples at hotexamples.com: 30 Example … birmingham fire footballhttp://ncm.gu.se/pdf/namnaren/4649_90_3-4.pdf danefold country marketWebb9 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 … dan efstatheu