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Check that lazy_ostream argument is printable #323

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6 changes: 6 additions & 0 deletions include/boost/test/utils/lazy_ostream.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,10 @@
// Boost.Test
#include <boost/test/detail/config.hpp>

// Boost
#include <boost/static_assert.hpp>
#include <boost/type_traits/has_left_shift.hpp>

// STL
#include <iosfwd>

Expand Down Expand Up @@ -74,6 +78,8 @@ class lazy_ostream_impl : public lazy_ostream {
, m_prev( prev )
, m_value( value )
{
BOOST_STATIC_ASSERT_MSG( (boost::has_left_shift<std::ostream,T>::value),
"Type has to implement operator<< to be printable");
}

std::ostream& operator()( std::ostream& ostr ) const BOOST_OVERRIDE
Expand Down