[boost] datetime and long long

[Markus Schöpflin]

Many of the regression tests for the date time library are failing currently because the library relies on std::abs<long long> being available. AKAIK, the C++ standard doesn't require this so the library shouldn't make use of it.

Maybe datetime should specify it's own version of abs like this:

#include <cstdlib>
#include <stdlib.h>

template <typename T> T abs(T i) { return std::abs(i); }
template <> long long abs(long long i) {return ::llabs(i); }

Markus


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