/usr/include/pbcopper/stream/Stream.h is in libpbcopper-dev 0.0.1+20161202-2.
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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 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | #ifndef PBCOPPER_STREAM_STREAM_H
#define PBCOPPER_STREAM_STREAM_H
#include "pbcopper/Config.h"
#include <functional>
namespace PacBio {
namespace Stream {
/// \brief Sink function type for data streams.
///
/// A sink function takes a data value and does some 'final' action on it, such
/// as printing.
///
/// Example:
/// \code{.cpp}
/// auto printToConsole = [](const int x) { std::cout << x; };
/// \endcode
///
template<typename T>
using Sink = std::function<void (const T&)>;
/// \brief Source function type for data streams.
///
/// A source function writes data to the sink provided.
///
/// Example:
/// \code{.cpp}
/// auto intList = [](Sink<std::int> out)
/// {
/// const std::vector<int> v = { 1,2,3,4,5 };
/// for (auto e : v)
/// out(e);
/// };
/// \endcode
///
template<typename T>
using Source = std::function<void (Sink<T>)>;
/// \brief Source function type for data streams.
///
/// A transform function takes a value, (likely) does some modification and
/// writes to the sink provided. Input & output types are allowed to differ.
///
/// Example:
/// \code{.cpp}
/// auto splitLines = [](Sink<std::string> out, std::string s)
/// {
/// auto stream = std::stringstream{ s };
/// auto token = std::string{ };
/// while (std::getline(stream, token)
/// out(token);
/// };
///
/// auto intToString = [](Sink<std::string> out, int x)
/// {
/// out( std::to_string(x) );
/// };
/// \endcode
///
template<typename T, typename U>
using Transform = std::function<void (Sink<U>, T)>;
/// \brief This method connects a Source to a Sink, in that order.
///
/// \param source data source
/// \param sink data sink
///
template<typename T>
void sourceToSink(Source<T> source, Sink<T> sink)
{
source(sink);
}
/// \brief This method connects a Transform to a Sink, in that order.
///
/// \param transform data transform
/// \param sink data sink
///
/// \returns a Sink function, which can transform data before the final action
///
template<typename T, typename U>
Sink<T> transformToSink (Transform<T,U> transform, Sink<U> sink)
{
return [transform, sink](const T& value) {
transform(sink, value);
};
}
/// \brief This method connects a Source to a Transform, in that order.
///
/// \param source data source
/// \param transform data transform
///
/// \returns a Source function, which provides transformed data
///
template<typename T, typename U>
Source<U> sourceToTransform (Transform<T,U> transform, Source<T> source)
{
return [transform, source](Sink<U> sink)
{
auto intermediateSink = [transform, sink](const T& value)
{
transform(sink, value);
};
source(intermediateSink);
};
}
/// \brief This method connects a Transform to another Transform.
///
/// \param t1 upstream data transform
/// \param t2 downstream data transform
///
/// \returns a Transform function representing the composite operation
///
template<typename T, typename Intermediate, typename U>
Transform<T,U> transformToTransform(Transform<T, Intermediate> t1,
Transform<Intermediate, U> t2)
{
return [t1, t2](Sink<U> finalSink, T originalValue)
{
auto intermediateSink = [t2,finalSink](const Intermediate& value)
{
t2(finalSink, value);
};
t1(intermediateSink, originalValue);
};
}
/// \brief Overloaded stream operator for chaining (source >> sink).
///
/// \param source data source
/// \param sink data sink
///
/// \sa sourceToSink
///
template<typename T, typename U>
void operator>>(Source<T> source, Sink<U> sink)
{
sourceToSink(source, sink);
}
/// \brief Overloaded stream operator for chaining (source >> transform).
///
/// \param source data source
/// \param transform data transform
///
/// \returns a Source function, which provides transformed data
/// \sa sourceToTransform
///
template<typename T, typename U>
Source<U> operator>>(Source<T> source, Transform<T,U> transform)
{
return sourceToTransform(transform, source);
}
/// \brief Overloaded stream operator for chaining (transform >> sink).
///
/// \param transform data transform
/// \param sink data sink
///
/// \returns a Sink function, which can transform data before the final action
/// \sa transformToSink
///
template<typename T, typename U>
Sink<T> operator>>(Transform<T,U> transform, Sink<U> sink)
{
return transformToSink(transform, sink);
}
/// \brief Overloaded stream operator for chaining (transform >> transform).
///
/// \param t1 upstream data transform
/// \param t2 downstream data transform
///
/// \returns a Transform function representing the composite operation
/// \sa transformToTransform
///
template<typename T, typename Intermediate, typename U>
Transform<T,U> operator>>(Transform<T, Intermediate> t1,
Transform<Intermediate, U> t2)
{
return transformToTransform(t1, t2);
}
} // namespace Stream
} // namespace PacBio
#endif // PBCOPPER_CLI_FXNCLI_H
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