//          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 SNOWHOUSE_ISLESSTHANCONSTRAINT_H
#define SNOWHOUSE_ISLESSTHANCONSTRAINT_H

#include "expressions/expression.h"

namespace snowhouse
{
    template <typename ExpectedType>
    struct IsLessThanConstraint : Expression<IsLessThanConstraint<ExpectedType>>
    {
        IsLessThanConstraint(const ExpectedType& expected): m_expected(expected)
        {
        }

        template <typename ActualType>
        bool operator()(const ActualType& actual) const
        {
            return (actual < m_expected);
        }

        ExpectedType m_expected;
    };

    template <typename ExpectedType>
    inline IsLessThanConstraint<ExpectedType> IsLessThan(
        const ExpectedType& expected)
    {
        return IsLessThanConstraint<ExpectedType>(expected);
    }

    inline IsLessThanConstraint<std::string> IsLessThan(const char* expected)
    {
        return IsLessThanConstraint<std::string>(expected);
    }

    template <typename ExpectedType>
    struct Stringizer<IsLessThanConstraint<ExpectedType>>
    {
        static std::string ToString(
            const IsLessThanConstraint<ExpectedType>& constraint)
        {
            std::ostringstream builder;
            builder << "less than "
                    << snowhouse::Stringize(constraint.m_expected);

            return builder.str();
        }
    };
}
#endif
