2024 Nim offsetof

Nim offsetof

Author: qnle

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. 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 . …

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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; } … 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 ... gentleman mix house

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

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warning: offset of on non-POD type

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. 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 … gentlemanly but wearing crossword clueWebb16 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 … gentlemanliness crossword solver

"Webb17 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 … " - Nim offsetof

Nim offsetof

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

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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 ... 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 …

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 … 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. …

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WebbC 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 …

Webb11 mars 2004 · Regardless of the implementation, the offsetof () macro takes two parameters. The first parameter is the structure name; the second, the name of the structure element. (I apologize for using a term as vague as “structure name.”. I'll refine this shortly.) A straightforward use of the macro is shown in Listing 2. gentleman motionWebb19 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 ... chris farley dead picWebbAttempting 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... chris farley characters snlWebb26 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 ... gentleman motorcycleWebb28 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.) gentleman minionsWebb27 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 … gentleman moscow movieWebb18 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 … gentleman motor yacht con motori gardner