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[intro.object] Make the storage in the example for storage providing properly aligned #6422

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Aug 30, 2023
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[intro.object] Make the storage in the example for storage providing properly aligned #6422

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b4a9f93
[intro.object] Make the storage in the example properly aligned
frederick-vs-ja Jul 28, 2023
eb7444a
[intro.object] Mention the assumption in the example
frederick-vs-ja Jul 29, 2023
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4 changes: 3 additions & 1 deletion source/basic.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -3207,6 +3207,8 @@
\end{note}
\begin{example}
\begin{codeblock}
// assumes that \tcode{sizeof(int)} is equal to 4

template<typename ...T>
struct AlignedUnion {
alignas(T...) unsigned char data[max(sizeof(T)...)];
Expand All @@ -3221,7 +3223,7 @@

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struct A { unsigned char a[32]; };
struct B { unsigned char b[16]; };
A a;
alignas(int) A a;
B *b = new (a.a + 8) B; // \tcode{a.a} provides storage for \tcode{*b}
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int *p = new (b->b + 4) int; // \tcode{b->b} provides storage for \tcode{*p}
// \tcode{a.a} does not provide storage for \tcode{*p} (directly),
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