Default parameters for templates in C++:
Like function default arguments, templates can also have default arguments. For example, in the following program, the second parameter U has the default value as char.
#include<iostream>
using namespace std;
template<class T, class U = char> class A
{
public:
T x;
U y;
};
int main()
{
A<char> a;
A<int, int> b;
cout<<sizeof(a)<<endl;
cout<<sizeof(b)<<endl;
return 0;
}
|
Output: (char takes 1 byte and int takes 4 bytes)
2
8
Also, similar to default function arguments, if one template parameter has a default argument, then all template parameters following it must also have default arguments. For example, the compiler will not allow the following program:
#include<iostream>
using namespace std;
template<class T = char, class U, class V = int> class A
{
};
int main()
{
}
|
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
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Last Updated :
29 May, 2017
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