/usr/include/dune/common/test/collectorstream.hh is in libdune-common-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
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#ifndef DUNE_COMMON_TEST_COLLECTORSTREAM_HH
#define DUNE_COMMON_TEST_COLLECTORSTREAM_HH
#include <sstream>
#include <string>
#include <functional>
#include <dune/common/typeutilities.hh>
namespace Dune {
/**
* \brief Data collector stream
*
* A class derived from std::ostringstream that allows to
* collect data via a temporary returned object. To facilitate
* this it stores a callback that is used to pass the collected
* data to its creator on destruction.
*
* In order to avoid passing the same data twice, copy construction
* is forbidden and only move construction is allowed.
*/
class CollectorStream : public std::ostringstream
{
public:
/**
* \brief Create from callback
*
* \tparam CallBack Type of callback. Must be convertible to std::function<void(std::string)>
* \param callBack A copy of this function will be stored and called on destruction.
*/
template<class CallBack,
Dune::disableCopyMove<CollectorStream, CallBack> = 0>
CollectorStream(CallBack&& callBack) :
callBack_(callBack)
{}
CollectorStream(const CollectorStream& other) = delete;
/**
* \brief Move constructor
*
* This will take over the data and callback from the
* moved from CollectorStream and disable the callback
* in the latter.
*/
CollectorStream(CollectorStream&& other) :
callBack_(other.callBack_)
{
(*this) << other.str();
other.callBack_ = [](std::string){};
}
/**
* \brief Destructor
*
* This calls the callback function given on creation
* passing all collected data as a single string argument.
*/
~CollectorStream()
{
callBack_(this->str());
}
private:
std::function<void(std::string)> callBack_;
};
} // namespace Dune
#endif // DUNE_COMMON_TEST_COLLECTORSTREAM_HH
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