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fix compile warnings due to missing override specifiers 

When building Snappy with compiler option `-Wsuggest-override` set
via the CMAKE_CXX_FLAGS, compilation produces warnings in
`snappy-sinksource.h`:

```
In file included from ./snappy-fork/snappy-sinksource.cc:32:
./snappy-fork/snappy-sinksource.h:150:18: error: ‘virtual size_t snappy::ByteArraySource::Available() const’ can be marked override [-Werror=suggest-override]
  150 |   virtual size_t Available() const;
      |                  ^~~~~~~~~
./snappy-fork/snappy-sinksource.h:151:23: error: ‘virtual const char* snappy::ByteArraySource::Peek(size_t*)’ can be marked override [-Werror=suggest-override]
  151 |   virtual const char* Peek(size_t* len);
      |                       ^~~~
./snappy-fork/snappy-sinksource.h:152:16: error: ‘virtual void snappy::ByteArraySource::Skip(size_t)’ can be marked override [-Werror=suggest-override]
  152 |   virtual void Skip(size_t n);
      |                ^~~~
./snappy-fork/snappy-sinksource.h:163:16: error: ‘virtual void snappy::UncheckedByteArraySink::Append(const char*, size_t)’ can be marked override [-Werror=suggest-override]
  163 |   virtual void Append(const char* data, size_t n);
      |                ^~~~~~
./snappy-fork/snappy-sinksource.h:164:17: error: ‘virtual char* snappy::UncheckedByteArraySink::GetAppendBuffer(size_t, char*)’ can be marked override [-Werror=suggest-override]
  164 |   virtual char* GetAppendBuffer(size_t len, char* scratch);
      |                 ^~~~~~~~~~~~~~~
./snappy-fork/snappy-sinksource.h:165:17: error: ‘virtual char* snappy::UncheckedByteArraySink::GetAppendBufferVariable(size_t, size_t, char*, size_t, size_t*)’ can be marked override [-Werror=suggest-override]
  165 |   virtual char* GetAppendBufferVariable(
      |                 ^~~~~~~~~~~~~~~~~~~~~~~
./snappy-fork/snappy-sinksource.h:168:16: error: ‘virtual void snappy::UncheckedByteArraySink::AppendAndTakeOwnership(char*, size_t, void (*)(void*, const char*, size_t), void*)’ can be marked override [-Werror=suggest-override]
  168 |   virtual void AppendAndTakeOwnership(
      |                ^~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
```

This PR adds the missing override specifiers to the sink
implementations, so compilation works fine again.

Tested it with g++-9.3 and g++-10.2.

Compatibility note:
Override specifiers were introduced with C++11, which Snappy seems
to effectively require, at least according to its CMakeLists.txt file
and due to the usage of some C++11-only STL types in its tests.
This commit is contained in:
jsteemann 2020-10-29 21:50:50 +01:00
parent 7ffaf77cf4
commit cb2b3c7ec6
1 changed files with 7 additions and 7 deletions
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14
snappy-sinksource.h
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@ -147,9 +147,9 @@ class ByteArraySource : public Source {
public:
ByteArraySource(const char* p, size_t n) : ptr_(p), left_(n) { }
virtual ~ByteArraySource();
virtual size_t Available() const;
virtual const char* Peek(size_t* len);
virtual void Skip(size_t n);
virtual size_t Available() const override;
virtual const char* Peek(size_t* len) override;
virtual void Skip(size_t n) override;
private:
const char* ptr_;
size_t left_;
@ -160,14 +160,14 @@ class UncheckedByteArraySink : public Sink {
public:
explicit UncheckedByteArraySink(char* dest) : dest_(dest) { }
virtual ~UncheckedByteArraySink();
virtual void Append(const char* data, size_t n);
virtual char* GetAppendBuffer(size_t len, char* scratch);
virtual void Append(const char* data, size_t n) override;
virtual char* GetAppendBuffer(size_t len, char* scratch) override;
virtual char* GetAppendBufferVariable(
size_t min_size, size_t desired_size_hint, char* scratch,
size_t scratch_size, size_t* allocated_size);
size_t scratch_size, size_t* allocated_size) override;
virtual void AppendAndTakeOwnership(
char* bytes, size_t n, void (*deleter)(void*, const char*, size_t),
void *deleter_arg);
void *deleter_arg) override;
// Return the current output pointer so that a caller can see how
// many bytes were produced.