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/**
** \file misc/indent.cc
** \brief Implementation of indentation relative functions.
**/
#include <iomanip>
#include <ostream>
#include <misc/contract.hh>
#include <misc/indent.hh>
namespace misc
{
namespace
{
/// The current indentation level for \a o.
inline long int& indent(std::ostream& o)
{
// The slot to store the current indentation level.
static const long int indent_index = std::ios::xalloc();
return o.iword(indent_index);
}
} // namespace
std::ostream& incindent(std::ostream& o)
{
indent(o) += 2;
return o;
}
std::ostream& decindent(std::ostream& o)
{
precondition(indent(o));
indent(o) -= 2;
return o;
}
std::ostream& resetindent(std::ostream& o)
{
indent(o) = 0;
return o;
}
std::ostream& iendl(std::ostream& o)
{
o << std::endl;
// Be sure to be able to restore the stream flags.
char fill = o.fill(' ');
return o << std::setw(indent(o)) << "" << std::setfill(fill);
}
std::ostream& incendl(std::ostream& o) { return o << incindent << iendl; }
std::ostream& decendl(std::ostream& o) { return o << decindent << iendl; }
} // namespace misc
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