Warning C26815
The pointer is dangling because it points at a temporary instance that was destroyed. (ES.65)
Remarks
There's a dangling pointer that is the result of an unnamed temporary that has been destroyed.
Code analysis name: LIFETIME_LOCAL_USE_AFTER_FREE_TEMP
Example
std::optional<std::vector<int>> getTempOptVec();
void loop() {
// Oops, the std::optional value returned by getTempOptVec gets deleted
// because there is no reference to it.
for (auto i : *getTempOptVec()) // warning C26815
{
// do something interesting
}
}
void views()
{
// Oops, the 's' suffix turns the string literal into a temporary std::string.
std::string_view value("This is a std::string"s); // warning C26815
}
These warnings can be fixed by extending the lifetime of the temporary object.
std::optional<std::vector<int>> getTempOptVec();
void loop() {
// Fixed by extending the lifetime of the std::optional value by giving it a name.
auto temp = getTempOptVec();
for (auto i : *temp)
{
// do something interesting
}
}
void views()
{
// Fixed by changing to a constant string literal.
std::string_view value("This is a string literal");
}
See also
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