indent.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_COMMON_INDENT_HH
#define DUNE_COMMON_INDENT_HH
 
#include <ostream>
#include <string>
 
namespace Dune {
 
  class Indent
  {
    const Indent* parent;
    std::string basic_indent;
    unsigned level;
 
  public:
 
    inline Indent(const std::string& basic_indent_ = "  ", unsigned level_ = 0)
      : parent(0), basic_indent(basic_indent_), level(level_)
    { }
 
    inline Indent(unsigned level_)
      : parent(0), basic_indent("  "), level(level_)
    { }
 
 
    inline Indent(const Indent* parent_,
                  const std::string& basic_indent_ = "  ", unsigned level_ = 1)
      : parent(parent_), basic_indent(basic_indent_), level(level_)
    { }
 
    inline Indent(const Indent* parent_, unsigned level_)
      : parent(parent_), basic_indent("  "), level(level_)
    { }
 
    inline Indent operator+(const std::string& newindent) const {
      return Indent(this, newindent);
    }
    inline Indent operator+(unsigned morelevel) const {
      return Indent(parent, basic_indent, level+morelevel);
    }
    inline Indent& operator++() { ++level; return *this; }
    inline Indent& operator--() { if ( level > 0 ) --level; return *this; }
 
    friend inline std::ostream& operator<<(std::ostream& s,
                                           const Indent& indent);
  };
 
  inline std::ostream& operator<<(std::ostream& s, const Indent& indent) {
    if(indent.parent)
      s << *indent.parent;
    for(unsigned i = 0; i < indent.level; ++i)
      s << indent.basic_indent;
    return s;
  }
 
} // namespace Dune
 
#endif // DUNE_COMMON_INDENT_HH