struct

问题 I need help with making this work for any type. I have got a function I need to accept other types that have ID property. I have tried using interfaces but that did not work for my ID property case. Here is the code: package main import ( "fmt" "strconv" ) type Mammal struct{ ID int Name string } type Human struct { ID int Name string HairColor string } func Count(ms []Mammal) *[]string { // How can i get this function to accept any type not just []Mammal IDs := make([]string, len(ms)) for i,

问题 I need help with making this work for any type. I have got a function I need to accept other types that have ID property. I have tried using interfaces but that did not work for my ID property case. Here is the code: package main import ( "fmt" "strconv" ) type Mammal struct{ ID int Name string } type Human struct { ID int Name string HairColor string } func Count(ms []Mammal) *[]string { // How can i get this function to accept any type not just []Mammal IDs := make([]string, len(ms)) for i,

问题 We can create structs in golang this way. Examples below: What are differences between these two? // Usual way type Employee struct { firstName string `json:"name"` salary int `json:"salary"` fullTime bool `json:"fullTime"` projects []Project `json:"projects"` } // Un-usal way with pointers type Employee struct { firstName *string `json:"name"` salary *int `json:"salary"` fullTime *bool `json:"fullTime"` projects *[]Project `json:"projects"` } Are there any trade-offs like memory? Update:

问题 We can create structs in golang this way. Examples below: What are differences between these two? // Usual way type Employee struct { firstName string `json:"name"` salary int `json:"salary"` fullTime bool `json:"fullTime"` projects []Project `json:"projects"` } // Un-usal way with pointers type Employee struct { firstName *string `json:"name"` salary *int `json:"salary"` fullTime *bool `json:"fullTime"` projects *[]Project `json:"projects"` } Are there any trade-offs like memory? Update:

问题 I have the following example #include <stdlib.h> #include <stdio.h> #include <stddef.h> typedef struct test{ int a; long b; int c; } test; int main() { test *t = (test*) malloc(offsetof(test, c)); t -> b = 100; } It works fine, but Im not sure about it. I think I have UB here. We have a pointer to an object of a structure type. But the object of the structure type is not really valid. I went through the standard and could not find any definition of this behavior. The only section I could find

问题 I have the following example #include <stdlib.h> #include <stdio.h> #include <stddef.h> typedef struct test{ int a; long b; int c; } test; int main() { test *t = (test*) malloc(offsetof(test, c)); t -> b = 100; } It works fine, but Im not sure about it. I think I have UB here. We have a pointer to an object of a structure type. But the object of the structure type is not really valid. I went through the standard and could not find any definition of this behavior. The only section I could find

问题 I have a structure of data that contains data values, time, unit, and some descriptions of each data. I want to plot the data values vs time. Here is how the data looks like: Any ideas how i can plot the data and time? 回答1: Quick example: %# date strings and values dates = {'02.11.2012 00:02:15'; '02.11.2012 00:07:12'}; values = [5.8; 5.7]; %# convert to serial date numbers t = datenum(dates, 'mm.dd.yyyy HH:MM:SS'); %# plot and format x-ticks as datetime plot(t,values) datetick('x') 回答2: You

问题 I'm trying to add a card into my Vect->Items card array, but I'm getting an access writing violation in my add at the Items array address. Is there something wrong with the initialization of the vector? The access writing violation occurs at the address of initialized vector, but I don't understand why it would be an error if it's just initializing. void VectorInit(Vector * vect, int capacity) { vect->size = 0; //initialize the size to 0 (no elements) vect->capacity = capacity; //initialize

问题 This is my csv file, i want to get only those row which start with character "A" so i got my output but with some addition column as '0' please help me to find were i went wrong? And one more thing i want to remove specific column like bread,anName,ot Name,id,bread,anName,Ot,number A,1,animal,tiger,op,8.1 M,2,animal,toper,ip,9.1 A1,7,animal,dog,cp,Na11 A2,9,animal,mouse,ap,0 A23,9,animal,pouch,gp,Na11 #include <stdio.h> #include <stdlib.h> #define NUMLETTERS 100 typedef struct { char Name[100

问题 I know this question might have been asked before but I wanted to take my approach at it and get an opinion or possibly a better way to do it. I have three files a.h a.c and main.c Prototypes of functions regarding the struct will be in a.h while implementation will be in a.c and called from main.c the structure will be simple it can just look like this struct ctx{ int x; }; I want a.c to be able to manipulate the contents of the struct but prevent main from having any idea of what's inside.