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Check -INT_MIN case in safe.hpp negate operator

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Nathan Hourt 2015-03-02 09:50:31 -05:00
parent e71ea52075
commit b393ddc1da
1 changed files with 8 additions and 3 deletions
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11
include/fc/safe.hpp
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@ -10,7 +10,7 @@ namespace fc {
* throw an exception on overflow conditions. * throw an exception on overflow conditions.
*/ */
template<typename T> template<typename T>
struct safe struct safe
{ {
template<typename O> template<typename O>
safe( O o ):value(o){} safe( O o ):value(o){}
@ -33,7 +33,12 @@ namespace fc {
} }
safe& operator *= ( T v ) { value *= v; return *this; } safe& operator *= ( T v ) { value *= v; return *this; }
safe& operator -= ( const safe& b ) { return *this += safe(-b.value); } safe& operator -= ( const safe& b ) { return *this += safe(-b.value); }
safe operator -()const{ return safe(-value); } safe operator -()const
{
if( value == std::numeric_limits<T>::min() )
FC_CAPTURE_AND_THROW( overflow_exception, (value) );
return safe(-value);
}
friend safe operator - ( const safe& a, const safe& b ) friend safe operator - ( const safe& a, const safe& b )
{ {
@ -63,6 +68,6 @@ namespace fc {
T value = 0; T value = 0;
}; };
} }
FC_REFLECT_TEMPLATE( (typename T), safe<T>, (value) ) FC_REFLECT_TEMPLATE( (typename T), safe<T>, (value) )