npos.h

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#ifndef NPOS_H
#define NPOS_H
 
#include <string>
#include <limits>
#include <type_traits>
 
#if 0
struct NPOS_t {
    template <typename T>
    friend constexpr bool operator == (T x, NPOS_t)
    {
        return x == std::numeric_limits<T>::max();
    }
 
    template <typename T>
    friend constexpr bool operator != (T x, NPOS_t)
    {
        return x != std::numeric_limits<T>::max();
    }
};
 
inline constexpr NPOS_t NPOS;
#endif
 
class FOUND {
private:
    bool found_ = false;
public:
    explicit FOUND(std::string::size_type t)
    {
        found_ = (t != std::string::npos);
    }
    template <typename T, typename U> FOUND(T t, U const &u)
    {
        found_ = (t != u.end());
    }
    explicit operator bool () const
    {
        return found_;
    }
};
 
#endif // NPOS_H