Utils.h

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#pragma once
 
#include <iosfwd>
#include <map>
#include <string>
 
namespace ogdf {
 
// Provides a nicer syntax for reading formatted input through streams, e.g.
// `stream >> a >> ';' >> y`.
class TokenIgnorer {
private:
    char m_c;
 
public:
    explicit TokenIgnorer(const char c) : m_c(c) {};
 
    friend std::istream& operator>>(std::istream& is, TokenIgnorer c);
};
 
std::istream& operator>>(std::istream& is, TokenIgnorer token);
 
template<typename E>
static inline E toEnum(const std::string& str, // A string we want to convert.
        std::string toString(const E&), const E first, const E last, const E def) // Enum informations.
{
    static std::map<std::string, E> map; // A map to be lazily evaluated.
    if (map.empty()) {
        // Iterating over enums is potentially unsafe... (fixable in C++11).
        for (int it = static_cast<int>(last); it >= static_cast<int>(first); it--) {
            const E e = static_cast<E>(it);
            map[toString(e)] = e;
        }
    }
 
    return map.find(str) == map.end() ? def : map[str];
}
 
}