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Add documentation about unwrap_ref back and add example

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Alexander Grund 2020-09-24 23:23:52 +02:00
parent cf5ac87499
commit 40a4b3ceb4
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1 changed files with 27 additions and 1 deletions
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28
doc/example/customization.cpp
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@ -87,7 +87,7 @@ struct near_constraint
template< typename Actual > template< typename Actual >
bool operator()( Actual actual ) const bool operator()( Actual actual ) const
{ {
return std::abs( actual - expected_ ) < threshold_ ; return std::abs( actual - mock::unwrap_ref(expected_) ) < mock::unwrap_ref(threshold_) ;
} }
friend std::ostream& operator<<( std::ostream& s, const near_constraint& c ) friend std::ostream& operator<<( std::ostream& s, const near_constraint& c )
@ -133,6 +133,32 @@ BOOST_AUTO_TEST_CASE( forty_one_plus_one_is_forty_two_plus_or_minus_one_near_cre
c.add( 41, 1 ); c.add( 41, 1 );
} }
//] //]
// Example of a "strong type" float
struct float_wrapper{
float value;
float_wrapper(float value): value(value){}
operator float() const { return value; }
friend std::ostream& operator<<( std::ostream& s, const float_wrapper& f)
{
return s << f.value;
}
};
BOOST_AUTO_TEST_CASE( near_constraint_works_with_with_float_wrapper_and_cref )
{
mock_view v;
calculator c( v );
float_wrapper expected = 0, threshold = 0;
// This works even without the unwrap_ref
MOCK_EXPECT( v.display ).once().with( near( expected, threshold ) );
// This requires 2 implicit conversion: from reference_wrapper to float_wrapper, then to float
// so unwrap_ref in near is required as C++ allows only 1 implicit conversion
MOCK_EXPECT( v.display ).once().with( near( std::cref( expected ), std::cref( threshold ) ) );
expected = 42;
threshold = 1;
c.add( 41, 1 );
}
} }
#undef MOCK_MAX_ARGS #undef MOCK_MAX_ARGS