StackOverflow2013

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plurals

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6030526
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0
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0
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2011-05-17T12:06:42.900
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0
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2011-05-17T12:06:42.900
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147192
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6029092
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2
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4
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0
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You cannot directly provide it, but you can actually use <code>any</code> as the underlying type... though for pointers it's pointless (ah!) <pre><code>struct any { std::type_info const& _info; void* _address; }; </code></pre> And a templated constructor: <pre><code>template <typename T> any::any(T* t): _info(typeid(*t)), _address(dynamic_cast<void*>(t)) { } </code></pre> This is, basically, <code>boost::any</code>. Now we need to "augment" it with our comparison mechanism. In order to do so, we'll "capture" the implementation of <code>std::less</code>. <pre><code>typedef bool (*Comparer)(void*,void*); template <typename T> bool compare(void* lhs, void* rhs) const { return std::less<T>()(*reinterpret_cast<T*>(lhs), *reinterpret_cast<T*>(rhs)); } template <typename T> Comparer make_comparer(T*) { return compare<T>; } </code></pre> And augment the constructor of <code>any</code>. <pre><code>struct any { std::type_info const& _info; void* _address; Comparer _comparer; }; template <typename T> any::any(T* t): _info(typeid(*t)), _address(dynamic_cast<void*>(t)), _comparer(make_comparer(t)) { } </code></pre> Then, we provided a specialization of <code>less</code> (or <code>operator<</code>) <pre><code>bool operator<(any const& lhs, any const& rhs) { if (lhs._info.before(rhs._info)) { return true; } if (rhs._info.before(lhs._info)) { return false; } return (*lhs._comparer)(lhs._address, rhs._address); } </code></pre> Note: encapsulation, etc... are left as an exercise to the reader
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1. POCompare boost::any contents
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1. USMatthieu M.
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