size_type max_size() const;
size_type max_size() const noexcept;
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// comparing size, length, capacity and max_size
#include <iostream>
#include <string>
int main ()
{
std::string str ("Test string");
std::cout << "size: " << str.size() << "\n";
std::cout << "length: " << str.length() << "\n";
std::cout << "capacity: " << str.capacity() << "\n";
std::cout << "max_size: " << str.max_size() << "\n";
return 0;
}size: 11 length: 11 capacity: 15 max_size: 4294967291