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#include <iostream>
template <int size> int len(const char (&str)[size])
{
return size;
}
int main()
{
std::string str;
std::cout << str.size() << " ";
str += '\0';
std::cout << str.size() << std::endl;
std::cout << sizeof("") << " ";
std::cout << sizeof("\0") << std::endl;
std::cout << len("") << " ";
std::cout << len("\0") << std::endl;
return 0;
}
