struct

问题 I'm trying to achieve this with the new async / await syntax, std::future::Future s and a recent version of Tokio. I'm using Tokio 0.2.0-alpha.4 and Rust 1.39.0-nightly . Different things I've tried include: using Box<dyn> s for the types that I want to store in the struct using generics in the struct definition I couldn't quite get a minimal working version, so here's a simplified version of what I'm trying to achieve: async fn foo(x: u8) -> u8 { 2 * x } // type StorableAsyncFn = Fn(u8) ->

问题 In SwiftUI I have a struct that want to hold data of the View. Let's say there is a View that user can create a recipe in it. It has a text field to type the recipe name, and options to choose and add to the array in the struct's properties. I managed to make the struct and introduce it in the View but I cannot change it values. The values of the struct should be updated based on what users does on the View and the info they add to it. I made a simple View that whatever is entered in the

问题 This question already has answers here : How to find the 'sizeof' (a pointer pointing to an array)? (13 answers) Closed 5 days ago . I know that there are a many similar questions out there on stackoverflow.com but I couldn't figure out a solution for myself. After quite some time on research, my brain is broken now even though I think the task I want to do is relatively simple. So I have two structs: struct files_t { file_t *file; }; struct file_t { unsigned char *bytes; unsigned int len; };

问题 #include <stdio.h> struct mychar { char value; struct mychar *nextPtr; }; typedef struct mychar Mychar; void instructions(); void append(Mychar **, char ); void printlist(Mychar *); int main(){ instructions(); Mychar *startPtr = NULL; unsigned int choice; char newchar; do { scanf("%d",&choice); switch (choice) { case 1: printf("\nWrite the character you want to add."); printf("\n> "); scanf(" %c", &newchar); append(&startPtr, newchar); printlist(startPtr); break; case 2: break; default:

问题 #include <stdio.h> struct mychar { char value; struct mychar *nextPtr; }; typedef struct mychar Mychar; void instructions(); void append(Mychar **, char ); void printlist(Mychar *); int main(){ instructions(); Mychar *startPtr = NULL; unsigned int choice; char newchar; do { scanf("%d",&choice); switch (choice) { case 1: printf("\nWrite the character you want to add."); printf("\n> "); scanf(" %c", &newchar); append(&startPtr, newchar); printlist(startPtr); break; case 2: break; default:

问题 #include <stdio.h> struct mychar { char value; struct mychar *nextPtr; }; typedef struct mychar Mychar; void instructions(); void append(Mychar **, char ); void printlist(Mychar *); int main(){ instructions(); Mychar *startPtr = NULL; unsigned int choice; char newchar; do { scanf("%d",&choice); switch (choice) { case 1: printf("\nWrite the character you want to add."); printf("\n> "); scanf(" %c", &newchar); append(&startPtr, newchar); printlist(startPtr); break; case 2: break; default:

问题 Is it possible to use aggregate initialization to make a pointer aptr point to a which is a member of the same struct ? struct S { int a; int* aptr; }; int main() { S s = { .a = 3, .aptr = &a //point aptr to a }; return 0; } The question is for both C and C++ . 回答1: A working initialization would be: struct S { int a; int* aptr; }; int main() { struct S s = {.a = 3, .aptr = &s.a}; printf("%d", *s.aptr); } Working samples: C11 GNU C++2a GNU Regarding the correctness of the initialization: For

问题 Consider following structure where the length of both username and password is 17: struct LoginPacket { public int unk1; public string username; public string password; } Also this byte array 00 00 00 00 6A 6D 32 6D 65 00 72 00 7A 76 72 00 98 FD 18 00 A0 68 65 72 65 49 73 70 61 73 73 00 00 00 00 00 FF FF 31 2E 30 30 2E 30 30 00 00 00 C7 9D 72 00 04 00 00 31 2E 31 30 2E 32 37 00 0C 2C F6 24 16 2C F6 24 16 Is it possible to load this byte array into the above structure? There is something

问题 Consider following structure where the length of both username and password is 17: struct LoginPacket { public int unk1; public string username; public string password; } Also this byte array 00 00 00 00 6A 6D 32 6D 65 00 72 00 7A 76 72 00 98 FD 18 00 A0 68 65 72 65 49 73 70 61 73 73 00 00 00 00 00 FF FF 31 2E 30 30 2E 30 30 00 00 00 C7 9D 72 00 04 00 00 31 2E 31 30 2E 32 37 00 0C 2C F6 24 16 2C F6 24 16 Is it possible to load this byte array into the above structure? There is something

问题 Consider following structure where the length of both username and password is 17: struct LoginPacket { public int unk1; public string username; public string password; } Also this byte array 00 00 00 00 6A 6D 32 6D 65 00 72 00 7A 76 72 00 98 FD 18 00 A0 68 65 72 65 49 73 70 61 73 73 00 00 00 00 00 FF FF 31 2E 30 30 2E 30 30 00 00 00 C7 9D 72 00 04 00 00 31 2E 31 30 2E 32 37 00 0C 2C F6 24 16 2C F6 24 16 Is it possible to load this byte array into the above structure? There is something