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#### *`abs-if-needed`* <a id="linalg.helpers.abs">[[linalg.helpers.abs]]</a>
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The name *`abs-if-needed`* denotes an exposition-only function object.
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The expression `abs-if-needed(E)` for a subexpression `E` whose type is
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`T` is expression-equivalent to:
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- `E` if `T` is an unsigned integer;
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- otherwise, `std::abs(E)` if `T` is an arithmetic type,
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- otherwise, `abs(E)`, if that expression is valid, with overload
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resolution performed in a context that includes the declaration
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``` cpp
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template<class U> U abs(U) = delete;
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```
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If the function selected by overload resolution does not return the
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absolute value of its input, the program is ill-formed, no diagnostic
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required.
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