StreamConstPtr: disallow passing a String temporary #8410
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(warning: deleting object of abstract class type 'Stream' which has non-virtual destructor will cause undefined behavior [-Wdelete-non-virtual-dtor])
mcspr
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Dec 15, 2021
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This no longer works
StreamConstPtr test{String("test")}; // String is destroyed next line, can't access it's contents
StreamConstPtr test{"test"}; // implicitly creating String{"test"}, same lifetime as aboveThis was allowed, but no longer is
StreamConstPtr{"test"}.available(); // ...since we are technically in the same 'expression', still and StreamConstPtr itself is a temporary?| virtual int peek() = 0; | ||
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| Stream() {} | ||
| virtual ~Stream() {} |
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hasenradball
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Nov 18, 2024
* StreamConstPtr: prevent from passing a temporary String instance * unconditionally allow progmem chars * missing virtual destructor in Stream (warning: deleting object of abstract class type 'Stream' which has non-virtual destructor will cause undefined behavior [-Wdelete-non-virtual-dtor])
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Unless using it like this:
using
auto var = StreamConstPtr(String-Temporary)leads to errors because it stores an expected-to-be invalid pointer.This PR prevents from using temporary
StringwithStreamConstPtr.(note :
StreamConstPtr("test").sendAll(elsewhere)is implicitely using an intermediateString)edit:
+ missing virtual destructor in
Stream::