Template errors?
Oct 22, 2013 at 4:05am UTC
My load function isnt working. I've tested it and returned it as an int and it worked but when i tried to compile when i changed it to a template i started getting the errors and I'm not sure how to fix it:
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all_sort.cpp:41:15: error: no matching function for call to 'load'
int *value = load("./integers.txt" , size);
^~~~
./bubble_sort.h:44:4: note: candidate template ignored: couldn't infer template
argument ' T'
T *load(const char* x, int &size) {
^
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#ifndef BUBBLE_SORT_H
#define BUBBLE_SORT_H
#include <fstream>
#include <iostream>
template <typename T>
void swap(T &a, T &b);
template <typename T>
T *load(const char * x, int & size);
//int* load (int x, int&);
template <typename T>
void bubbleSort(T arr[], int n) {
bool isSorted = false ;
for (int last = n-1; last > 0 && !isSorted; last--) {
isSorted = true ;
for (int i = 0; i < last; i++)
if (arr[i] > arr[i+1]) {
swap(arr[i], arr[i+1]);
isSorted = false ;
}
}
}
template <typename T>
void print(T arr[], int n) {
for (int i = 0; i < n; i ++)
std::cout << arr[i] << " " ;
std::cout << std::endl;
}
template <typename T>
void swap(T &a, T &b) {
T t = a;
a = b;
b = t;
}
template <typename T>
T *load(const char * x, int &size) {
std::ifstream infile;
infile.open(x);
T c;
infile >> c;
size++;
//std::cout << c << std::endl;
T *a = new T[10];
int i = 0;
while (infile) {
a[i] = c;
std::cout << a[i] << " " ;
i++;
size++;
infile >> c;
}
std::cout << "Size " << size << std::endl;
std::cout << std::endl;
infile.close();
return a;
}
#endif
I'm trying to use my load function to load integers from a file into and array and then return it back.
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#include "bubble_sort.h"
#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;
int main(){
int n, pick = 1, size = 0;
n = 10;
cout << "Bubble Sort: " << endl;
int *value = load("./integers.txt" , size);
return 0;
}
Oct 22, 2013 at 4:18am UTC
The diagnostic is quite clear about what is wrong, isn't it?
candidate template ignored:
couldn't infer template argument 'T'
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// int *value = load("./integers.txt", size);
int *value = load<int >("./integers.txt" , size);
Use
std::vector<>
http://www.mochima.com/tutorials/vectors.html
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