/
prefixedoutstream_impl.hpp
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/
prefixedoutstream_impl.hpp
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/**
* @file core/util/prefixedoutstream_impl.hpp
* @author Ryan Curtin
* @author Matthew Amidon
*
* Implementation of templated PrefixedOutStream member functions.
*
* mlpack is free software; you may redistribute it and/or modify it under the
* terms of the 3-clause BSD license. You should have received a copy of the
* 3-clause BSD license along with mlpack. If not, see
* http://www.opensource.org/licenses/BSD-3-Clause for more information.
*/
#ifndef MLPACK_CORE_UTIL_PREFIXEDOUTSTREAM_IMPL_HPP
#define MLPACK_CORE_UTIL_PREFIXEDOUTSTREAM_IMPL_HPP
// Just in case it hasn't been included.
#include "prefixedoutstream.hpp"
#ifdef MLPACK_HAS_BFD_DL
#include "backtrace.hpp"
#endif
#include <iostream>
#include <sstream>
namespace mlpack {
namespace util {
template<typename T>
PrefixedOutStream& PrefixedOutStream::operator<<(const T& s)
{
BaseLogic<T>(s);
return *this;
}
/**
* These are all necessary because gcc's template mechanism does not seem smart
* enough to figure out what I want to pass into operator<< without these. That
* may not be the actual case, but it works when these is here.
*/
inline PrefixedOutStream& PrefixedOutStream::operator<<(bool val)
{
BaseLogic<bool>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(short val)
{
BaseLogic<short>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(unsigned short val)
{
BaseLogic<unsigned short>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(int val)
{
BaseLogic<int>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(unsigned int val)
{
BaseLogic<unsigned int>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(long val)
{
BaseLogic<long>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(unsigned long val)
{
BaseLogic<unsigned long>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(float val)
{
BaseLogic<float>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(double val)
{
BaseLogic<double>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(long double val)
{
BaseLogic<long double>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(void* val)
{
BaseLogic<void*>(val);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(const char* str)
{
BaseLogic<const char*>(str);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(std::string& str)
{
BaseLogic<std::string>(str);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(std::streambuf* sb)
{
BaseLogic<std::streambuf*>(sb);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(
std::ostream& (*pf)(std::ostream&))
{
BaseLogic<std::ostream& (*)(std::ostream&)>(pf);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(std::ios& (*pf)(std::ios&))
{
BaseLogic<std::ios& (*)(std::ios&)>(pf);
return *this;
}
inline PrefixedOutStream& PrefixedOutStream::operator<<(
std::ios_base& (*pf) (std::ios_base&))
{
BaseLogic<std::ios_base& (*)(std::ios_base&)>(pf);
return *this;
}
// For non-Armadillo types.
template<typename T>
typename std::enable_if<!arma::is_arma_type<T>::value>::type
PrefixedOutStream::BaseLogic(const T& val)
{
// We will use this to track whether or not we need to terminate at the end of
// this call (only for streams which terminate after a newline).
bool newlined = false;
std::string line;
// If we need to, output the prefix.
PrefixIfNeeded();
std::ostringstream convert;
// Sync flags and precision with destination stream
convert.setf(destination.flags());
convert.precision(destination.precision());
convert << val;
if (convert.fail())
{
PrefixIfNeeded();
if (!ignoreInput)
{
destination << "Failed type conversion to string for output; output not "
"shown." << std::endl;
newlined = true;
}
}
else
{
line = convert.str();
// If the length of the casted thing was 0, it may have been a stream
// manipulator, so send it directly to the stream and don't ask questions.
if (line.length() == 0)
{
// The prefix cannot be necessary at this point.
if (!ignoreInput) // Only if the user wants it.
destination << val;
return;
}
// Now, we need to check for newlines in the output and print it.
size_t nl;
size_t pos = 0;
while ((nl = line.find('\n', pos)) != std::string::npos)
{
PrefixIfNeeded();
// Only output if the user wants it.
if (!ignoreInput)
{
destination << line.substr(pos, nl - pos);
destination << std::endl;
}
newlined = true; // Ensure this is set for the fatal exception if needed.
carriageReturned = true; // Regardless of whether or not we display it.
pos = nl + 1;
}
if (pos != line.length()) // We need to display the rest.
{
PrefixIfNeeded();
if (!ignoreInput)
destination << line.substr(pos);
}
}
// If we displayed a newline and we need to throw afterwards, do that.
if (fatal && newlined)
{
if (!ignoreInput)
destination << std::endl;
// Print a backtrace, if we can.
#ifdef MLPACK_HAS_BFD_DL
if (fatal && !ignoreInput && backtrace)
{
size_t nl;
size_t pos = 0;
Backtrace bt;
std::string btLine = bt.ToString();
while ((nl = btLine.find('\n', pos)) != std::string::npos)
{
PrefixIfNeeded();
if (!ignoreInput)
{
destination << btLine.substr(pos, nl - pos);
destination << std::endl;
}
carriageReturned = true; // Regardless of whether or not we display it.
pos = nl + 1;
}
}
#endif
throw std::runtime_error("fatal error; see Log::Fatal output");
}
}
// For Armadillo types.
template<typename T>
typename std::enable_if<arma::is_arma_type<T>::value>::type
PrefixedOutStream::BaseLogic(const T& val)
{
// Extract printable object from the input.
const arma::Mat<typename T::elem_type>& printVal(val);
// We will use this to track whether or not we need to terminate at the end of
// this call (only for streams which terminate after a newline).
bool newlined = false;
std::string line;
// If we need to, output the prefix.
PrefixIfNeeded();
std::ostringstream convert;
// Check if the stream is in the default state.
if (destination.flags() == convert.flags() &&
destination.precision() == convert.precision())
{
printVal.print(convert);
}
else
{
// Sync flags and precision with destination stream
convert.setf(destination.flags());
convert.precision(destination.precision());
// Set width of the convert stream.
const arma::Mat<typename T::elem_type>& absVal(arma::abs(printVal));
double maxVal = absVal.max();
if (maxVal == 0.0)
maxVal = 1;
const int maxLog = int(log10(maxVal)) + 1;
const int padding = 4;
convert.width(convert.precision() + maxLog + padding);
printVal.raw_print(convert);
}
if (convert.fail())
{
PrefixIfNeeded();
if (!ignoreInput)
{
destination << "Failed type conversion to string for output; output not "
"shown." << std::endl;
newlined = true;
}
}
else
{
line = convert.str();
// If the length of the casted thing was 0, it may have been a stream
// manipulator, so send it directly to the stream and don't ask questions.
if (line.length() == 0)
{
// The prefix cannot be necessary at this point.
if (!ignoreInput) // Only if the user wants it.
destination << val;
return;
}
// Now, we need to check for newlines in the output and print it.
size_t nl;
size_t pos = 0;
while ((nl = line.find('\n', pos)) != std::string::npos)
{
PrefixIfNeeded();
// Only output if the user wants it.
if (!ignoreInput)
{
destination << line.substr(pos, nl - pos);
destination << std::endl;
}
newlined = true; // Ensure this is set for the fatal exception if needed.
carriageReturned = true; // Regardless of whether or not we display it.
pos = nl + 1;
}
if (pos != line.length()) // We need to display the rest.
{
PrefixIfNeeded();
if (!ignoreInput)
destination << line.substr(pos);
}
}
// If we displayed a newline and we need to throw afterwards, do that.
if (fatal && newlined)
{
if (!ignoreInput)
destination << std::endl;
// Print a backtrace, if we can.
#ifdef MLPACK_HAS_BFD_DL
if (fatal && !ignoreInput)
{
size_t nl;
size_t pos = 0;
Backtrace bt;
std::string btLine = bt.ToString();
while ((nl = btLine.find('\n', pos)) != std::string::npos)
{
PrefixIfNeeded();
if (!ignoreInput)
{
destination << btLine.substr(pos, nl - pos);
destination << std::endl;
}
carriageReturned = true; // Regardless of whether or not we display it.
pos = nl + 1;
}
}
#endif
throw std::runtime_error("fatal error; see Log::Fatal output");
}
}
// This is an inline function (that is why it is here and not in .cc).
void PrefixedOutStream::PrefixIfNeeded()
{
// If we need to, output a prefix.
if (carriageReturned)
{
if (!ignoreInput) // But only if we are allowed to.
destination << prefix;
carriageReturned = false; // Denote that the prefix has been displayed.
}
}
} // namespace util
} // namespace mlpack
#endif // MLPACK_CORE_UTIL_PREFIXEDOUTSTREAM_IMPL_HPP