chapter-4-undefined_bool.hpp

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// ===-- chapter-4/chapter-4-undefined_bool.hpp ----------- -*- C++ -*- --=== //
#ifndef CHAPTER_4_UNDEFINED_BOOL
#define CHAPTER_4_UNDEFINED_BOOL
 
 
namespace chapter4 {
 
template <bool B> struct undefined_false;
 
template <> struct undefined_false<true>
{
    static bool const value = true;
    typedef undefined_false<true> type;
};
 
 
template <bool B> struct undefined_true;
 
template <> struct undefined_true<false>
{
    static bool const value = false;
    typedef undefined_true<false> type;
};
 
} // namespace chapter4
 
#endif // CHAPTER_4_UNDEFINED_BOOL