C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C2591
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     Compiler error C2591
 
     'identifier' : ambiguous user-defined conversions in conditional
     expression
 
     The specified conditional expression could not be converted to an
     integral type.
 
     An expression in a conditional expression must unambiguously
     convert to an integral type.
 
     Ambiguous conversion can be caused when a conversion operator and
     a constructor making the same conversion have been defined.
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