c++ - error C4146: unary minus operator applied to unsigned type, result still unsigned -

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i try build crf++ in visual studio 2013 , error in last line:

array_[begin + siblings[i].code].base =             value_ ?             static_cast<array_type_>(-value_[siblings[i].left]-1) :             static_cast<array_type_>(-siblings[i].left-1);

error c4146: unary minus operator applied unsigned type, result still unsigned

specifically, in darts.h, line 189.

i built again in visual studio 2015 there no error.

how can fix in visual studio 2013?

try this:

int tmp = static_cast<int>(siblings[i].left);  array_[begin + siblings[i].code].base =             value_ ?             static_cast<array_type_>(-value_[siblings[i].left]-1) :             static_cast<array_type_>(-tmp - 1);

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