/usr/include/wvstreams/wvfunctorencoder.h is in libwvstreams-dev 4.6.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | /* -*- Mode: C++ -*-
* Worldvisions Weaver Software:
* Copyright (C) 1997-2002 Net Integration Technologies, Inc.
*
* Provides an encoder for applying a functor to data extracted
* from a buffer and stored in another.
* Assumes binary input is in machine order.
*/
#ifndef __WVFUNCTORENCODER_H
#define __WVFUNCTORENCODER_H
#include "wvtypedencoder.h"
/**
* Functor specifies the functor type which must have an operator()
* with a signature compatible with invocations of the form:
* const IT data = ...;
* OT result = func(data);
*
* The best way to use this monster is to subclass with friendly
* names for the implementations that are needed. For maximum
* performance, define the functor as a struct that provides an
* operator() inline. This is extremely efficent since this class is
* templated, so there's room for lots of compiler optimization.
*
* "IT" is the input buffer datatype
* "OT" is the output buffer datatype
* "FT" is the functor type
*/
template<class IT, class OT, class FT>
class WvFunctorEncoder : public WvTypedEncoder<IT, OT>
{
protected:
FT f;
public:
typedef FT FType;
typedef IT IType;
typedef OT OType;
typedef WvBufBase<IType> IBuffer;
typedef WvBufBase<OType> OBuffer;
WvFunctorEncoder(const FType &f) : f(f) { }
virtual ~WvFunctorEncoder() { }
protected:
virtual bool _typedencode(IBuffer &inbuf, OBuffer &outbuf,
bool flush)
{
size_t count;
while ( (count = inbuf.optgettable()) )
{
size_t avail = outbuf.optallocable();
if (avail == 0)
return ! flush;
if (avail < count)
count = avail;
const IType *indata = inbuf.get(count);
OType *outdata = outbuf.alloc(count);
while (count-- > 0)
*(outdata++) = f(*(indata++));
}
return true;
}
virtual bool _reset()
{
// Assume most functor encoders will be stateless and therefore
// support reset() implicitly.
// If this is not the case, then override this method for
// particular subclasses to return false.
return true;
}
};
#endif // __WVFUNCTORENCODER_H
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