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// Copyright Joakim Karlsson & Kim Gräsman 2010-2012.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef IGLOO_EQUALSWITHDELTACONSTRAINT_H
#define IGLOO_EQUALSWITHDELTACONSTRAINT_H
#include "./expressions/expression.h"
namespace snowhouse {
template< typename ExpectedType, typename DeltaType >
struct EqualsWithDeltaConstraint : Expression< EqualsWithDeltaConstraint<ExpectedType, DeltaType> >
{
EqualsWithDeltaConstraint(const ExpectedType& expected, const DeltaType& delta)
: m_expected(expected), m_delta(delta)
{
}
template<typename ActualType>
bool operator()(const ActualType& actual) const
{
return ((m_expected <= (actual + m_delta)) && (m_expected >= (actual - m_delta)));
}
ExpectedType m_expected;
DeltaType m_delta;
};
template< typename ExpectedType, typename DeltaType >
inline EqualsWithDeltaConstraint<ExpectedType, DeltaType> EqualsWithDelta(const ExpectedType& expected, const DeltaType& delta)
{
return EqualsWithDeltaConstraint<ExpectedType, DeltaType>(expected, delta);
}
template< typename ExpectedType, typename DeltaType >
struct Stringizer< EqualsWithDeltaConstraint< ExpectedType, DeltaType > >
{
static std::string ToString(const EqualsWithDeltaConstraint<ExpectedType, DeltaType>& constraint)
{
std::ostringstream builder;
builder << "equal to " << snowhouse::Stringize(constraint.m_expected) << " (+/- " << snowhouse::Stringize(constraint.m_delta) << ")";
return builder.str();
}
};
}
#endif
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