StackOverflow2013

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primarykey
Id
15057528
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0
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0
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0
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CreationDate
2013-02-24T22:38:33.623
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0
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2013-02-24T22:44:41.543
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2013-02-24T22:44:41.543
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1176973
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1176973
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15057140
PostTypeId
2
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0
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0
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text
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<pre><code>MESONS pi = PI(); MATTER mat = pi; assert (pi == mat); </code></pre> <p>Do you mind a little C++11 template magic?</p> <pre><code>template <typename T, typename... L> struct is_defined_in : std::false_type {}; template <typename T, typename U, typename... L> struct is_defined_in<T, U, L...> : is_defined_in<T, L...> {}; template <typename T, typename... L> struct is_defined_in<T, T, L...> : std::true_type {}; template <int ID> struct helper { friend bool operator==(helper a, helper b) { return a.id == b.id; } friend bool operator!=(helper a, helper b) { return a.id != b.id; } int id=ID; }; template <typename... B> struct category { int id; template <typename T, typename = typename std::enable_if<is_defined_in<T, B...>::value>::type> category(T t) : id(t.id) {} friend bool operator==(category a, category b) { return a.id == b.id; } friend bool operator!=(category a, category b) { return a.id != b.id; } }; enum class ElementaryParticleTypesID { PI, PROTON, NEUTRON, ELECTRON }; struct PI : helper<(int)ElementaryParticleTypesID::PI> {}; struct PROTON : helper<(int)ElementaryParticleTypesID::PROTON> {}; struct NEUTRON : helper<(int)ElementaryParticleTypesID::NEUTRON> {}; struct ELECTRON : helper<(int)ElementaryParticleTypesID::ELECTRON> {}; using MESONS = category<PI>; using BARYONS = category<PROTON, NEUTRON>; using LEPTONS = category<ELECTRON>; using MATTER = category<MESONS, BARYONS, LEPTONS>; </code></pre> <p>(<code>the static_assert</code> currently doesn't work beyond two hierarchies, but this can be added if you want to)</p>
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