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您好所有我一直与我的数组列表，并使用了一段时间了，现在我只是想在我的数组列表在这个程序中使用结构类型：的ArrayList无法返回一个struct
#include "stdio.h"
#include "Header.h"
int main(int argc, char**argv)
{
struct Params
{
int i;
int j;
};
Params p2;
p2.i = 2;
p2.j = 3;
List::ArrayList<Params> p = List::ArrayList<Params>();
p.add(p2);
printf("i: %d, j: %d", p.get(0).i, p.get(0).j);
return 0;
}
，这是我的ArrayList程序：
#ifndef ARRAYLIST_H_
#define ARRAYLIST_H_
#include <iostream>
using namespace std;
namespace List
{
template <class T>//template - allows the user to choose what type to store in the list
class ArrayList
{
private://private variables
int length = 1;//sets the length to 1
T *a1 = (T*)calloc(length, sizeof(T));//allocates enough memory for 1 item
public://public functions
ArrayList()
{//constructor
//does nothing but you probably already knew that
}
~ArrayList(){//destructor
//frees up the memory that a1 is pointing to
free(a1);
}
inline void add(T item){//adds an item to the list
if (length != 0)
{//if length is not equal to 0
a1 = (T*)realloc(a1, length*sizeof(T));//re-allocates memory
a1[length - 1] = item;//adds item to the end of the list
length++;//adds 1 to the length
}
else
{//else if it is equal to 0
a1[length] = item;//adds item to the front of the list
}
}
inline void remove(T item){
if (length != 0)
{
length--;//subtracts 1 from the length
T *b = (T*)calloc(length, sizeof(T));//creates a new pointer to a memory block of size length
int idxModifier = 0;//modifies the index so it adds the items to the array in the right places
int i = 0;//counter/index
while (i < length){
if (a1[i] != item)//if the item at the index of i is not equal to item we want to delete
{
b[i] = a1[i + idxModifier];
}
else
{
idxModifier++;//adds 1 to the index modifier
b[i] = a1[i + 1];//adds the next item so we dont add the item back to the array
}
i++;//adds one to i
}
if (count != 0)
a1 = (T*)realloc(b, length*sizeof(T));
else
cout << "The item does not exist!" << endl;//lets the user know that item does not exist
free(b);//frees up the memory that b allocated at the top of the function
}
else
{
cout << "You cannot delete anything because there is nothing in the list" << endl;//lets the user know that there is nothing in the list
}
}
inline T get(int i){//gets the integer at the index of i
return length != 0 ? a1[i] : NULL;//returns a[i] if the length is not 0, if it is 0 then it returns NULL wich is defined as 0
}
inline void set(int i, T type)
{
a1[i] = type;//sets whatever is at teh index of i to type
}
inline int size(){//gets the size
return length != 0 ? length - 1 : NULL;//if the length is not equal to 0 then it returns the length-1 , if it is not 0 then it returns NULL
}
inline void print(){//prints the list
if (length != 0)
{
cout << "[";//prints the end bracket
for (int i = 0; i < size(); i++){
if (i == 0)//if the index is equal to the beginning of the list
cout << a1[0];//print the first item
else
cout << ", " << a1[i];//prints a comma before the item to seperate the items
}
cout << "]" << endl;//prints the end bracket
}
else
{
cout << "There is nothing in the array to print!" << endl;//lets the user know that the list is empty
}
}
};
};
#endif
当我尝试运行它，我得到这个错误：错误C2446：“：”：没有转换，从“诠释”到“主:: PARAMS”上线86 我完全卡在这个任何人有任何建议，我不知道该怎么办我认为这可能是因为t他的模板是因为它说它必须返回一个int，但这不是真的，因为它可以与其他类型一起工作，所以也许它只是结构。注意：第86行是get函数
哪条线是86？ – user2079303 2014-09-23 05:56:32
对不起，第86行是获取函数 – AnonymousUser 2014-09-23 05:57:14