What does the following line mean? constexpr static const std::uint8_t CLASS_ERROR = 0x02; [closed]

by 
namespace ABC
{
    constexpr static const std::uint8_t CLASS_ERROR     = 0x02;
}

constexpr itself tells that its a const expression. Why do we need const after static? What does this line mean to the compiler?

I searched in Google to understand this line.

  • const -> read-only.

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  • “I searched in Google to understand this line.” and did not get any results? Hard to believe. If you did get results, then which? And why did they not help you? I for example searched for “constexpr static const” and found, among many more hits, a promising video explanation first hit. Without explaining what is missing in the most prominent hits, you risk getting only answer which tell you the same unhelpful things.

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