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fixed an overflow error caused by choosing too small a type to store variables #2

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Aug 21, 2023
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fixed an overflow error caused by choosing too small a type to store variables #2

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6 changes: 4 additions & 2 deletions src/methods/nnf/NodeManager.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -252,8 +252,10 @@ class NodeManager {
@param[in] nbVar, the number of variables in the problem.
*/
static NodeManager<T> *makeNodeManager(unsigned nbVar) {
if (nbVar < (1 << 8)) return new NodeManagerTyped<T, uint8_t>();
if (nbVar < (1 << 16)) return new NodeManagerTyped<T, uint16_t>();
// One bit is reserved for the sign of the variable.
// Hence, with 8 bits we can store variables from -(2⁷-1) up to 2⁷-1. Same holds for 16 and 32 bits.
if (nbVar < (1 << 7)) return new NodeManagerTyped<T, uint8_t>();
if (nbVar < (1 << 15)) return new NodeManagerTyped<T, uint16_t>();
return new NodeManagerTyped<T, uint32_t>();
} // makeNodeManager

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