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[swappable.requirements] Requires should now be Preconditions #4886

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Merged
merged 3 commits into from
Sep 25, 2021
Merged

[swappable.requirements] Requires should now be Preconditions #4886

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78ff3f4
Requires should now be Mandates
brevzin Sep 9, 2021
ede308c
Shalls shall not exist.
brevzin Sep 9, 2021
1345785
Preconditions: Mandates shall be required.
brevzin Sep 25, 2021
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5 changes: 3 additions & 2 deletions source/lib-intro.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -1612,17 +1612,18 @@
User code can ensure that the evaluation of \tcode{swap} calls
is performed in an appropriate context under the various conditions as follows:
\begin{codeblock}
#include <cassert>
#include <utility>

// Requires: \tcode{std::forward<T>(t)} shall be swappable with \tcode{std::forward<U>(u)}.
// Preconditions: \tcode{std::forward<T>(t)} is swappable with \tcode{std::forward<U>(u)}.
template<class T, class U>
void value_swap(T&& t, U&& u) {
using std::swap;
swap(std::forward<T>(t), std::forward<U>(u)); // OK: uses ``swappable with'' conditions
// for rvalues and lvalues
}

// Requires: lvalues of \tcode{T} shall be swappable.
// Preconditions: lvalues of \tcode{T} are swappable.
template<class T>
void lv_swap(T& t1, T& t2) {
using std::swap;
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