有关BOOST_CHECK_CLOSE_FRACTION的问题 [英] Problem with BOOST_CHECK_CLOSE_FRACTION

问题描述

我正在使用Boost :: Test库，我想检查实际的百分比值是否接近预期值：

I'm using the Boost::Test library, and I am trying to check if an actual percent value is close to the expected value:

BOOST_CHECK_CLOSE_FRACTION(
    items[i].ExpectedPercent,
    items[i].ActualCount / totalCount,
    0.05);

由于某种原因，即使值足够接近，此检查也会失败：

For some reason this check fails even when the values are close enough:

difference between items[i].ExpectedPercent{0.40000000000000002}
   and items[i].ActualCount / totalReturned{0.42999999999999999}
                                    exceeds 0.050000000000000003

这是Boost的问题还是我使用Boost的问题？

Is this a problem with Boost or a problem with how I am using Boost?

推荐答案

经过一些测试，结果证明BOOST_CHECK_CLOSE_FRACTION的文档不正确。

After some testing, it turns out that the documentation for BOOST_CHECK_CLOSE_FRACTION is incorrect. The tolerance should be specified as a fraction of the expected value.

所以，TFAE：

BOOST_CHECK(abs(x - y) < (min(x, y) * 0.1));
BOOST_CHECK_CLOSE(x, y, 10);
BOOST_CHECK_CLOSE_FRACTION(x, y, 0.1);

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