tmp/tmp2a3x4a6g/{from.md → to.md}
RENAMED
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@@ -3,12 +3,13 @@
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**Change:** Replace `common_reference_with` in
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`three_way_comparable_with`, `equality_comparable_with`, and
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`totally_ordered_with` with an exposition-only concept. **Rationale:**
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Allow uncopyable, but movable, types to model these concepts. **Effect
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on original feature:** Valid C++20 code relying on subsumption with
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-
`common_reference_with` may fail to compile in this revision of C++.
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-
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``` cpp
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template<class T, class U>
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requires equality_comparable_with<T, U>
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bool attempted_equals(const T&, const U& u); // previously selected overload
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@@ -20,5 +21,7 @@ bool attempted_equals(const T& t, const U& u); // ambiguous overload; previousl
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bool test(shared_ptr<int> p) {
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return attempted_equals(p, nullptr); // ill-formed; previously well-formed
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}
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```
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**Change:** Replace `common_reference_with` in
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`three_way_comparable_with`, `equality_comparable_with`, and
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`totally_ordered_with` with an exposition-only concept. **Rationale:**
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Allow uncopyable, but movable, types to model these concepts. **Effect
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on original feature:** Valid C++20 code relying on subsumption with
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+
`common_reference_with` may fail to compile in this revision of C++.
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+
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[*Example 1*:
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``` cpp
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template<class T, class U>
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requires equality_comparable_with<T, U>
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bool attempted_equals(const T&, const U& u); // previously selected overload
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bool test(shared_ptr<int> p) {
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return attempted_equals(p, nullptr); // ill-formed; previously well-formed
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}
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```
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+
— *end example*]
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+
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