coord: add front/back methods
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@ -60,6 +60,12 @@ namespace util { namespace coord {
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auto begin (void) { return std::begin (this->data); }
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auto begin (void) { return std::begin (this->data); }
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auto end (void) { return std::end (this->data); }
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auto end (void) { return std::end (this->data); }
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const T& front (void) const { return this->data[0]; }
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T& front (void) { return this->data[0]; }
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const T& back (void) const { return this->data[S-1]; }
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T& back (void) { return this->data[S-1]; }
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///////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////
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// conversions
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// conversions
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template <template <size_t, typename> class K>
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template <template <size_t, typename> class K>
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