Working with Multiple Typenames in Templates
Sometimes you will need more than one type to use in the function, and for this you can simply add more template parameters. Just make sure you give them different names.
Note
There is no inherent limit to the number of template parameters. However, as a general guideline keep the number of them as low as possible.
Create the function template print_pair that allows you to output a formatted message containing a pair of values. By defining the template parameters, you can specify the types of the two values you want to print.
Tehtävä
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Create and call a template with multiple type parameters.
- Fill in the
___to complete the template definition. - Call the template twice:
- First call: Use
<int, std::string>as the template types. - Second call: Use
<char, float>as the template types.
- First call: Use
Ratkaisu
solution
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#include <iostream>
template<typename Type1, typename Type2>
void print_pair(Type1 first, Type2 second)
{
std::cout << "{ pair: " << first << ", " << second << " }" << std::endl;
}
int main()
{
// Specifying one more type
print_pair<int, std::string>(5, "cats");
print_pair<char, float>('q', 12.5);
}
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Osio 1. Luku 4
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#include <iostream>
template<___ ___, ___ ___>
void print_pair(___ first, ___ second)
{
std::cout << "{ pair: " << first << ", " << second << " }" << std::endl;
}
int main()
{
// Specify one more type
print_pair<int, ___>(5, "cats");
print_pair<___, ___>('q', 12.5);
}
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