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testFunction.cpp

#include <testFunction.h>
#include <halfFunction.h>
#include <iostream>
#include <assert.h>


using namespace std;

namespace {


float
divideByTwo (float x)
{
    return x / 2;
}


struct timesN
{
    timesN (float n): n (n) {}
    float operator () (float x) {return x * n;}
    float n;
};


} // namespace


void
testFunction ()
{
    cout << "halfFunction<T>\n";

    halfFunction <float> d2 (divideByTwo);

    assert (d2 (0)  ==  0);
    assert (d2 (2)  ==  1);
    assert (d2 (-2) == -1);
    assert (d2 (HALF_MAX)  ==  HALF_MAX / 2);
    assert (d2 (-HALF_MAX) == -HALF_MAX / 2);
    assert (d2 (half::posInf()) == 0);
    assert (d2 (half::negInf()) == 0);
    assert (d2 (half::qNan())   == 0);

    halfFunction <half> t5 (timesN (5),         // function
                      0, HALF_MAX / 8,    // domain
                      -1,                 // default value
                      half::posInf(),     // posInfValue
                      half::negInf(),     // negInfValue
                      half::qNan());      // nanValue

    assert (t5 (0)  ==  0);
    assert (t5 (2)  == 10);
    assert (t5 (-2) == -1);
    assert (t5 (HALF_MAX)  == -1);
    assert (t5 (-HALF_MAX) == -1);

    assert ( t5(half::posInf()).isInfinity());
    assert (!t5(half::posInf()).isNegative());

    assert (t5(half::negInf()).isInfinity());
    assert (t5(half::negInf()).isNegative());

    assert (t5(half::qNan()).isNan());

    cout << "ok\n\n" << flush;
}

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