Boost的数据驱动测试'联接运算符`+`破坏了第一列 [英] Boost's data-driven tests' join operator `+` corrupts first column

问题描述

考虑以下代码:

BOOST_DATA_TEST_CASE(
      sampleTest,
      (data::make(1) ^ data::make(2)) + (data::make(3) ^ data::make(4)),
      var1,
      var2)
{
  std::cout << var1 << "," << var2 << std::endl;
}

我期望的输出是:

1,2
3,4

但是，var1似乎已损坏:

$> ./MyTests --run_test=Tests/sampleTest
Running 2 test cases...
202875304,2
202875304,4

*** No errors detected
$> ./MyTests --run_test=Tests/sampleTest
Running 2 test cases...
83976616,2
83976616,4

*** No errors detected

我做错什么了吗?

推荐答案

那是一个错误.长话短说:请向图书馆维护者报告.

That's a bug. Long story short: please report it to the library maintainers.

实际上，zip操作返回一个元组std::tuple<int const&, int const&>:

Indeed, the zip operation returns a tuple std::tuple<int const&, int const&>:

尽管当时数据集本身还处于活动状态，但是在join操作中通过引用返回了元组...:

and though the dataset itself is properly alive at the time, the tuple is returned by reference in the join operation...:

    sample const&       operator*() const   { return m_first_size > 0 ? *m_it1 : *m_it2; }

正确的解决方法是扩展

The proper fix would be to extend the dataset concept to not only have a ::sample type¹ but also a ::reference type. That's quite an invasive change.

¹奇怪的是目前没有记载

¹ strangely not documented at this time

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