使用空 boost::accumulators
Using empty boost::accumulators
如何检查一个空的 boost::accumulators acc 与否?
例如:
if (acc.isEmpty())//I don't know what function here
return 0;
else
return boost::accumulators::mean(acc).
因为如果它是空的,我得到 NaN for boost::accumulators::mean(acc).
你可以使用累加器count
:
if (boost::accumulators::count(acc) == 0)//I don't know what function here
return 0;
else
return boost::accumulators::mean(acc);
或者,您可以通过调用 std::isnan
:
来检查它是否为 nan
if(std::isnan(boost::accumulators::mean(acc))
return 0;
else
return boost::accumulators::mean(acc);
如何检查一个空的 boost::accumulators acc 与否?
例如:
if (acc.isEmpty())//I don't know what function here
return 0;
else
return boost::accumulators::mean(acc).
因为如果它是空的,我得到 NaN for boost::accumulators::mean(acc).
你可以使用累加器count
:
if (boost::accumulators::count(acc) == 0)//I don't know what function here
return 0;
else
return boost::accumulators::mean(acc);
或者,您可以通过调用 std::isnan
:
nan
if(std::isnan(boost::accumulators::mean(acc))
return 0;
else
return boost::accumulators::mean(acc);