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jll63 merged 1 commit into from
Nov 3, 2026
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doc: troubleshooting: say what a virtual_ptr parameter may be #140

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7 changes: 4 additions & 3 deletions doc/modules/ROOT/pages/troubleshooting.adoc
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Expand Up @@ -385,9 +385,10 @@ gcc.
smart pointer to it.

| `virtual_ptr<> must be passed by value or by const reference`
| A method takes a `virtual_ptr` by non-const lvalue reference, or by rvalue
reference. Neither works as a virtual parameter: take it by value, which is
cheap, or by const reference.
| A virtual parameter is declared as `virtual_ptr<Node>&` or
`virtual_ptr<Node>&&`. A method can take a `virtual_ptr` only by value,
`virtual_ptr<Node>`, which is cheap, or by const reference,
`const virtual_ptr<Node>&`.

| `std::shared_ptr cannot be passed by non-const lvalue reference`
| Pass a `std::shared_ptr` or a `shared_virtual_ptr` by value, or by const
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