错误无法转换 &#39;coll&#39;（类型 &#39;std::__cxx11::list<char> &#39;) 输入 &#39;const char&amp;&#39;

Question

here I'm trying to implement a generic function to print all elements of a container but I am getting following errors,

#include<iostream>
#include<list>

using namespace std;
template <typename T>
void print_elements(const T& coll)
{
    for (const auto& elem : coll)
    {
    std::cout << elem << ' ';
    }
}

int main()
{
    list<char> coll; // list container for character elements

    //appenading a to z using lists
    for (char i = 'a'; i <= 'z'; ++i)
    {
        coll.push_back(i); //using the push back function 
    }

    for (auto elem : coll)   // in this case we have to use a range based for loop
    {       
    cout << elem << ' ';
    }
    cout << endl;
    cout << coll.size();

    print_elements<char>(coll);  
    return 0;
}

I am also getting these errors:

candidate: 'template void print_elements(const T&)' void print_elements(const T& coll) template argument deduction/substitution failed:

no matching function for call to 'print_elements(std::__cxx11::list&)'
print_elements(coll);

Answer 1

I think the error is in this line

     print_elements<char>(coll);  

Change this to

     print_elements<list<char>>(coll);

or you may put like this

     print_elements(coll);

Answer 2

Error is in the following line

print_elements<char>(coll);

because you specify that the template function parameter is of type char but you coll is not of type char but of type std::list<char> .

Therefore, you need to either pass correct parameter type like:

print_elements< std::list<char> >(coll);

or let the template argument deduction determine template arguments types automatically like:

print_elements(coll);