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CSVWriter.hpp
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CSVWriter.hpp
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//===-- rosa/support/csv/CSVWriter.hpp --------------------------*- C++ -*-===//
//
// The RoSA Framework
//
//===----------------------------------------------------------------------===//
///
/// \file rosa/support/csv/CSVWriter.hpp
///
/// \author David Juhasz (david.juhasz@tuwien.ac.at)
///
/// \date 2017
///
/// \brief Facitilities to write CSV files.
///
//===----------------------------------------------------------------------===//
#ifndef ROSA_SUPPORT_CSV_CSVWRITER_HPP
#define ROSA_SUPPORT_CSV_CSVWRITER_HPP
#include <iostream>
#include <ostream>
namespace rosa {
namespace csv {
/// Provides facilities to write values into a CSV file.
///
/// The writer emits a comma, the character `,`, between each written values.
/// The resulted stream is a flat CSV file as it consists of onlyone row, no new
/// line is emitted.
///
/// \tparam T type of values to write
template <typename T>
class CSVWriter {
public:
/// Creates a new instance.
///
/// \param [in,out] S output stream to write to
///
/// \note The writer operates on non-binary outputs as long as \p S is in
/// good state.
CSVWriter(std::ostream &S)
: Str(S.good() && !(S.flags() & std::ios::binary) ? &S : nullptr),
IsFirst(true) {}
/// Tells if the last operation was successful.
///
/// \return if the last operation was successful
bool good(void) const noexcept {
return Str != nullptr;
}
/// Writes an entry to the output stream.
///
/// The implementation does anything only if the last operation was
/// successful. If so, \p V is written to \c rosa::csv::CSVWriter::Str.
/// The emitted value is preceded with a comma if the actual call is not the
/// first one for \p this object. Success of the operation is checked at the
/// end.
///
/// \param V value to write
void write(const T &V) {
if (Str) {
if (!IsFirst) {
*Str << ',';
} else {
IsFirst = false;
}
*Str << V;
if (!Str->good()) {
Str = nullptr;
}
}
}
private:
std::ostream *Str; ///< Output stream to write to.
bool IsFirst; ///< Denotes if the next write would be the first one.
};
/// Writes a value to a CSV file with \c rosa::csv::CSVWriter.
///
/// \see rosa::csv::CSVWriter
///
/// \tparam T type of value to write
///
/// \param [in,out] W object to write with
/// \param V value to write
///
/// \return \p W after writing \p V with it
template <typename T>
CSVWriter<T> &operator<<(CSVWriter<T> &W, const T& V) {
W.write(V);
return W;
}
} // End namespace csv
} // End namespace rosa
#endif // ROSA_SUPPORT_CSV_CSVWRITER_HPP

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