mirror of
https://github.com/triqs/dft_tools
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71 lines
2.1 KiB
C++
71 lines
2.1 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) 2014 by 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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#pragma once
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#include <ostream>
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#include <sstream>
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namespace triqs {
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namespace utility {
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/**
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* \brief Output stream with a condition
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*
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* This class behaves pretty much like a standard ostream
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* except that the printing is "under" condition
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*
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* Example:
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*
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* debug_stream rep( std::cerr, [&mc](){ return mc.config_id() %100 == 0;}
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*
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*/
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class debug_stream {
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std::ostream* out;
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std::function<bool()> condition;
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public:
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debug_stream(std::ostream* out_, std::function<bool()> condition) : out(out_), condition(condition) {}
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debug_stream(std::ostream* out_) : out(out_) {}
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template <class T> debug_stream& operator<<(T const& x) {
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#ifdef TRIQS_DEBUG
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if (condition && condition()) (*out) << x;
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#endif
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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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debug_stream& operator<<(StandardEndLine manip) {
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// call the function, but we cannot return it's value
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#ifdef TRIQS_DEBUG
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if (condition && condition()) manip(*out);
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#endif
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return *this;
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}
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};
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}
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}
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