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Both checks for Expects(ExtentType::size() != dynamic_extent); in storage_type are always useless. storage_type<ExtentType> is only ever created with ExtentType == extent_type<Extent>, where Extent has type std::size_t and is the extent of the span. Looking at extent_type<std::size_t Ext>::size(): - if Ext != dynamic_extent, then size() always returns Ext, and therefore size() != dynamic_extent - if Ext == dynamic_extent, then size() returns extent_type<dynamic_extent>::size_. size_ can only be set via one of two constructors: - constexpr explicit extent_type(size_type size), which already does the check in question - constexpr explicit extent_type(extent_type<Other> ext) : size_(ext.size()), which simply relies on the other extent's size() method So there is no way for ExtentType::size() == dynamic_extent. |
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