enum type in C++

This works:

enum TPriority 
{
    EPriorityIdle = -100,
    EPriorityLow = -20,
    EPriorityStandard = 0,
    EPriorityUserInput = 10,
    EPriorityHigh = 20
};

TPriorit开发者_如何学JAVAy priority = EPriorityIdle; 

But this doesn't work:

TPriority priority = -100;

Any reason?

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It works too, but you need explicit type

TPriority priority = (TPriority)-100;

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shortly put: it defeats the purpose of having an enum

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You cannot assign an int to an enum, even if the value matches one of the enum's values.

However, casting will work:

TPriority priority = static_cast<TPriority>(-100);

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There is no type conversion from the values of an enum type to the enum type itself. Only the other way around.