I have a working implementation of testing the time of a function for search methods, which take:
checkSearchTime(T(*funcPointer) (T myArray[], int size, T wanted)
as parameters, I try to do the same thing with sort methods:
checkSortTime(T(*funcPointer) (T myArray[],int size)
and I get an error. This is the error:
Error C2664 'void checkSortTime<int>(T (__cdecl *)(T [],int),T [],int)': cannot convert argument 1 from 'void (__cdecl *)(T [],int)' to 'T (__cdecl *)(T [],int)'
Here is the code for both files:
int main() {
memLeaks();
constexpr auto SIZE = 5;
int myArray[SIZE];
populateArrayRandom(myArray, SIZE);
PrintArray(myArray, SIZE);
//insertionSort(myArray, SIZE);
PrintArray(myArray, SIZE);
checkSearchTime(binary_search, myArray, SIZE, 12);
checkSortTime(selectionSort, myArray, SIZE); // THIS IS WHERE THE ERROR IS
//checkAllSorts(myArray, SIZE); // WOULD LIKE TO CALL THIS AFTER
}
template<typename T>
void checkSearchTime(T(*funcPointer) (T myArray[], int size, T wanted),
T arrayArgument[], int sizeArgument, T wantedArgument) {
// Use auto keyword to avoid typing long
auto start = std::chrono::high_resolution_clock::now();
funcPointer(arrayArgument, sizeArgument, wantedArgument);
auto stop = std::chrono::high_resolution_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::nanoseconds>(stop - start);
//std::cout << "Microseconds: " << duration.count() << std::endl;
std::cout << "[" << duration.count() << "] Nanoseconds" << std::endl;
}
template<typename T>
void checkAllSearches(T myArray[], int size, T value) {
std::cout << "Search Implementations and Timing\n";
std::cout << "Binary=";
checkSearchTime(binary_search, myArray, size, value);
std::cout << "Linear=";
checkSearchTime(linear_search, myArray, size, value);
std::cout << "JumpSearch=";
checkSearchTime(jump_search, myArray, size, value);
std::cout << "Exponential=";
checkSearchTime(exponential_search, myArray, size, value);
std::cout << "FibMonaccian=";
checkSearchTime(fibMonaccian_search, myArray, size, value);
}
template<typename T>
void checkSortTime(T(*funcPointer) (T myArray[],int size), //tried const here, doesn't work either
T arrayArgument[], int sizeArgument) {
// Use auto keyword to avoid typing long
auto start = std::chrono::high_resolution_clock::now();
funcPointer(arrayArgument, sizeArgument);
auto stop = std::chrono::high_resolution_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::nanoseconds>(stop - start);
//std::cout << "Microseconds: " << duration.count() << std::endl;
std::cout << "[" << duration.count() << "] Nanoseconds" << std::endl;
}
CodePudding user response:
Nvm it was because sort methods don't return anything =)
CodePudding user response:
As you have already figured it out, the return type of your sort function (selectionSort
) must have been void
.
So, I am just posting this answer for others that might face a similar issue.
Changing this
template<typename T>
void checkSortTime(T(*funcPointer)
to the following, will solve the issue:
void checkSortTime(void(*funcPointer)
CodePudding user response:
Not really an answer, but just to let you know: passing arrays by "const T(&name)[const size]" keeps the size with the array. And you promise not to change its content (const). This syntax can also be used in templates like this (In this example I just return the value, didn't update to return void):
#include <iostream>
template<typename T, std::size_t N>
T checkSearchTime(T(*funcPointer)(const T(&myArray)[N], const T& wanted), const T (&arrayArgument)[N], const T& wantedArgument)
{
return funcPointer(arrayArgument, wantedArgument);
}
template<std::size_t N>
int lookup(const int(&arr)[N], const int& value)
{
for (int i = 0; i < N; i) std::cout << i << " ";
std::cout << "\n";
return value;
}
int main()
{
int arr[]{ 1,2,3,4,5 };
int wanted = 3;
int value = checkSearchTime(lookup, arr, wanted);
std::cout << "value = " << value;
}
Happy coding