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https://github.com/triqs/dft_tools
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78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2011 by M. Ferrero, O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_UTILITY_REPORT_STREAM_H
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#define TRIQS_UTILITY_REPORT_STREAM_H
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#include <ostream>
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#include <sstream>
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namespace triqs { namespace utility {
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/**
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* \brief Output stream with flexible verbosity level.
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*
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* This class behaves pretty much like a standard ostream but you can also
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* set some verbosity level
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*
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* Example:
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*
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* report_stream rep(2); // this creates a report stream w/ verbosity 2
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* rep << "Hello" << endl; // this prints Hello
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* rep(2) << "Hello2" << endl; // this prints Hello2
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* rep(3) << "Hello3" << endl; // this doesn't print anything because the verbosity < 3
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*
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*/
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class report_stream {
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std::ostream * out;
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int verbosity;
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public:
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report_stream(std::ostream * out_, int verbosity_ = 1): out(out_), verbosity(verbosity_) {}
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report_stream operator () (int n) {
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return report_stream(out, verbosity-n+1);
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}
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template<class T>
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report_stream & operator << (T const & x) {
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if (verbosity > 0) (*out)<<x;
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return *this;
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}
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// this is the type of std::cout
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typedef std::basic_ostream<char, std::char_traits<char> > CoutType;
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// this is the function signature of std::endl
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typedef CoutType& (*StandardEndLine)(CoutType&);
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// define an operator<< to take in std::endl
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report_stream & operator << (StandardEndLine manip) {
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// call the function, but we cannot return it's value
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if (verbosity > 0) manip(*out);
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return *this;
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}
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};
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}}
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#endif
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