Error C2039 'at': is not a member of std::bitset < 19 > ;

Error C2039 'at': is not a member of std::bitset <19 > TestLayout c:\demo_temp\layout_demo\testlayout\layouthelper.cpp 108

1. Control Positioning and Sizing using a C++ Helper Class

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2. std::bitset::at() disappear in VS2015

my fix is to change at() function into index operator: [] :

return m_options[option];

3. C2653 or C2039 error when you try to reference a function from the STD C++ library

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4. std::bitset

The class template bitset represents a fixed-size sequence of N bits. Bitsets can be manipulated by standard logic operators and converted to and from strings and integers..

5. C++ in Visual Studio

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