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This is an Operator class. Just an idea I had for making operators way too object-oriented
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#ifndef Truth_Operator_h | |
#define Truth_Operator_h | |
#include <iostream> | |
#include <vector> | |
#include <string> | |
#include <map> | |
#include <functional> | |
using namespace std; | |
enum Arity { | |
Unary, | |
Binary | |
}; | |
enum Associativity { | |
LeftRight, | |
RightLeft | |
}; | |
template<class T> | |
class Node; | |
typedef function<bool (bool lhs, bool rhs)> LogicalOperation; | |
typedef function<void (Node<string> *)> TraversalLambda; | |
typedef int Precedence; | |
class Operator { | |
public: | |
Operator(Precedence p, Arity ar, Associativity as, LogicalOperation op) : | |
precedence(p), arity(ar), associativity(as), operation(op) {}; | |
Operator(string s); | |
const Precedence precedence; | |
const Arity arity; | |
const Associativity associativity; | |
const LogicalOperation operation; | |
const string stringRepresentation; | |
private: | |
}; | |
const static Operator NOT_PREFIX(1, Unary, RightLeft, [](bool lhs, bool rhs) -> bool { return !rhs; }); | |
const static Operator NOT_POSTFIX(1, Unary, LeftRight, [](bool lhs, bool rhs) -> bool { return !lhs; }); | |
const static Operator AND(2, Binary, LeftRight, [](bool lhs, bool rhs) -> bool { return lhs && rhs; }); | |
const static Operator NAND(2, Binary, LeftRight, [](bool lhs, bool rhs) -> bool { return !(lhs && rhs); }); | |
const static Operator OR(3, Binary, LeftRight, [](bool lhs, bool rhs) -> bool { return lhs || rhs; }); | |
const static Operator NOR(3, Binary, LeftRight, [](bool lhs, bool rhs) -> bool { return !(lhs || rhs); }); | |
const static Operator XOR(3, Binary, LeftRight, [](bool lhs, bool rhs) -> bool { return lhs != rhs; }); | |
const static Operator IF(4, Binary, LeftRight, [](bool lhs, bool rhs) -> bool { return !lhs || rhs; }); | |
const static Operator IFF(5, Binary, LeftRight, [](bool lhs, bool rhs) -> bool { return lhs == rhs; }); | |
const static map<string, Operator>operatorMap = { | |
{"!", NOT_PREFIX}, {"~", NOT_PREFIX}, {"¬", NOT_PREFIX}, | |
{"'", NOT_POSTFIX}, | |
{"^", AND}, {"∧", AND}, {"&", AND}, {"*", AND}, {"•", AND}, | |
{"|", NAND}, {"⊼", NAND}, | |
{"+", OR}, {"∨", OR}, | |
{"-", NOR}, {"↓", NOR}, | |
{"⊕", XOR}, {"⊻", XOR}, | |
{"⇒", IF}, {"→", IF}, {"⊃", IF}, | |
{"⇔", IFF}, {"≡", IFF}, {"↔", IFF}, {"=", IFF} | |
}; | |
Operator::Operator(string s) : precedence(operatorMap.at(s).precedence), arity(operatorMap.at(s).arity), associativity(operatorMap.at(s).associativity), operation(operatorMap.at(s).operation), stringRepresentation(s) {} | |
#endif |
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