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Everything: Add -Wnon-virtual-dtor
flag
This flag warns on classes which have `virtual` functions but do not have a `virtual` destructor. This patch adds both the flag and missing destructors. The access level of the destructors was determined by a two rules of thumb: 1. A destructor should have a similar or lower access level to that of a constructor. 2. Having a `private` destructor implicitly deletes the default constructor, which is probably undesirable for "interface" types (classes with only virtual functions and no data). In short, most of the added destructors are `protected`, unless the compiler complained about access.
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@ -33,6 +33,9 @@ namespace TextCodec {
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class Decoder {
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public:
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virtual String to_utf8(const StringView&) = 0;
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protected:
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virtual ~Decoder() = default;
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};
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class UTF8Decoder final : public Decoder {
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