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## Arithmetic conversion on enumerations <a id="depr.arith.conv.enum">[[depr.arith.conv.enum]]</a>
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The ability to apply the usual arithmetic conversions
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[[expr.arith.conv]] on operands where one is of enumeration type and the
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other is of a different enumeration type or a floating-point type is
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deprecated.
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[*Note 1*: Three-way comparisons [[expr.spaceship]] between such
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operands are ill-formed. — *end note*]
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[*Example 1*:
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``` cpp
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enum E1 { e };
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enum E2 { f };
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bool b = e <= 3.7; // deprecated
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int k = f - e; // deprecated
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auto cmp = e <=> f; // error
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```
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— *end example*]
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