Colour class
          #include <eckit/log/Colour.h>
        
        
Public static functions
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              static auto on(std::ostream&) -> std:: ostream& 
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              static auto off(std::ostream&) -> std:: ostream& 
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              static auto reset(std::ostream&) -> std:: ostream& 
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              static auto bold(std::ostream&) -> std:: ostream& 
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              static auto underline(std::ostream&) -> std:: ostream& 
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              static auto blink(std::ostream&) -> std:: ostream& 
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              static auto reverse(std::ostream&) -> std:: ostream& 
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              static auto hidden(std::ostream&) -> std:: ostream& 
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              static auto black(std::ostream&) -> std:: ostream& 
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              static auto red(std::ostream&) -> std:: ostream& 
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              static auto green(std::ostream&) -> std:: ostream& 
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              static auto yellow(std::ostream&) -> std:: ostream& 
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              static auto magenta(std::ostream&) -> std:: ostream& 
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              static auto blue(std::ostream&) -> std:: ostream& 
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              static auto cyan(std::ostream&) -> std:: ostream& 
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              static auto white(std::ostream&) -> std:: ostream& 
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              static auto blackBackground(std::ostream&) -> std:: ostream& 
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              static auto redBackground(std::ostream&) -> std:: ostream& 
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              static auto greenBackground(std::ostream&) -> std:: ostream& 
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              static auto yellowBackground(std::ostream&) -> std:: ostream& 
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              static auto magentaBackground(std::ostream&) -> std:: ostream& 
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              static auto blueBackground(std::ostream&) -> std:: ostream& 
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              static auto cyanBackground(std::ostream&) -> std:: ostream& 
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              static auto whiteBackground(std::ostream&) -> std:: ostream&