yap/test/depth_stress_test_right.cpp

#define BOOST_YAP_CONVERSION_OPERATOR_TEMPLATE 1
#include <boost/yap/expression.hpp>

#include <gtest/gtest.h>

#include <sstream>


template <typename T>
using term = boost::yap::terminal<boost::yap::expression, T>;

namespace yap = boost::yap;


TEST(right, depth_stress_test)
{
    term<double> unity{1.0};

    {
        auto expr = unity + unity + unity + unity +    unity + unity + unity + unity;
        double result = expr;
        EXPECT_EQ(result, 8.0);
    }

    {
        auto expr =
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +

            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity;
        double result = expr;
        EXPECT_EQ(result, 64.0);
    }

#if 0 // This makes the Travis VMs barf.
    {
        auto expr =
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +

            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity +
            unity + unity + unity + unity +    unity + unity + unity + unity;
        double result =
            expr + expr + expr + expr +    expr + expr + expr + expr +
            expr + expr + expr + expr +    expr + expr + expr + expr +
            expr + expr + expr + expr +    expr + expr + expr + expr +
            expr + expr + expr + expr +    expr + expr + expr + expr;
        EXPECT_EQ(result, 64.0 * 32.0);
    }
#endif
}