SensibleStack.h

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#ifndef SRC_SENSIBLESTACK_H_
#define SRC_SENSIBLESTACK_H_
 
#include <stack>
#include <string>
#include <type_traits>
 
template <typename T, typename = std::enable_if<std::is_arithmetic_v<T>>>
class SensibleStack : public std::stack<T> {
    public:
        SensibleStack() : std::stack<T>() {}
        static const T zero = T(0);
 
        T top() {
            if (this->empty()) {
                return zero;
            }
            return std::stack<T>::top();
        }
 
        inline void pop() {
            if (!this->empty()) {
                std::stack<T>::pop();
            }
        }
};
 
class SensibleStringStack : public std::stack<std::string> {
    public:
        SensibleStringStack() : std::stack<std::string>() {}
 
        std::string top() {
            if (this->empty()) {
                return "";
            }
            return std::stack<std::string>::top();
        }
 
        inline void pop() {
            if (!this->empty()) {
                std::stack<std::string>::pop();
            }
        }
};
 
#endif // SRC_SENSIBLESTACK_H_