topical media & game development
professional-program-11-FunctionTemplate-FindTemplatePtr.c
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professional-program-11-FunctionTemplate-FindTemplatePtr.c
include <iostream>
include <cstring>
using namespace std;
include <SpreadsheetCell.h>
template <typename T>
int Find(T& value, T* arr, int size)
{
cout << "original\n";
for (int i = 0; i < size; i++) {
if (arr[i] == value) {
// found it; return the index
return (i);
}
}
// failed to Find it; return -1
return (-1);
}
template <typename T>
int Find(T*& value, T** arr, int size)
{
cout << "ptr special\n";
for (int i = 0; i < size; i++) {
if (*arr[i] == *value) {
// found it; return the index
return (i);
}
}
// failed to Find it; return -1
return (-1);
}
/*
template <typename T>
int Find<T*>(T*& value, T** arr, int size)
{
cout << "ptr special\n";
for (int i = 0; i < size; i++) {
if (*arr[i] == *value) {
// found it; return the index
return (i);
}
}
// failed to Find it; return -1
return (-1);
}
*/
template<>
int Find<char*>(char*& value, char** arr, int size)
{
cout << "Specialization\n";
for (int i = 0; i < size; i++) {
if (strcmp(arr[i], value) == 0) {
// found it; return the index
return (i);
}
}
// failed to find it; return -1
return (-1);
}
int Find(char*& value, char** arr, int size)
{
cout << "overload\n";
for (int i = 0; i < size; i++) {
if (strcmp(arr[i], value) == 0) {
// found it; return the index
return (i);
}
}
// failed to find it; return -1
return (-1);
}
int main(int argc, char** argv)
{
char* word = "two";
char* arr[4] = {"one", "two", "three", "four"};
int res;
int x = 3, intArr[4] = {1, 2, 3, 4};
double d1 = 5.6, dArr[4] = {1.2, 3.4, 5.7, 7.5};
res = Find(x, intArr, 4); // calls find<int> by deduction
res = Find<int>(x, intArr, 4); // call find<int> explicitly
res = Find(d1, dArr, 4); // call find<double> by deduction
res = Find<double>(d1, dArr, 4); // calls find<double> explicitly
res = Find<char *>(word, arr, 4); // Calls the template specialization for char *s
res = Find(word, arr, 4); // Calls the overloaded Find for char *s
int *px = &x, *pArr[2] = {&x, &x};
res = Find(px, pArr, 2); // Calls the overloaded Find for pointers
SpreadsheetCell c1(10), c2[2] = {SpreadsheetCell(4), SpreadsheetCell(10)};
res = Find(c1, c2, 2); // calls find<SpreadsheetCell> by deduction
res = Find<SpreadsheetCell>(c1, c2, 2); // calls find<SpreadsheetCell> explicitly
SpreadsheetCell *pc1 = &c1;
SpreadsheetCell *psa[2] = {&c1, &c1};
res = Find(pc1, psa, 2); // Calls the overloaded Find for pointers
return (0);
}
(C) Æliens
20/2/2008
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