C++ (Cpp) Context::Assign示例

示例#1

 int main () {
     // example expression: (true and x) or (y and (not x))
     
     BooleanExp* expression;
     Context context;
     
     VariableExp* x = new VariableExp("X");
     VariableExp* y = new VariableExp("Y");
     
     expression = new OrExp(new AndExp(new Constant(true), x), new AndExp(y, new NotExp(x)));
     
     context.Assign(x, false);
     context.Assign(y, true);
     
     bool result = expression->Evaluate(context);
     
     VariableExp* z = new VariableExp("Z");
     NotExp not_z(z);
     
     BooleanExp* replacement = expression->Replace("Y", not_z);
     
     context.Assign(z, true);
     
     result = replacement->Evaluate(context);
     
     return 0;
 }

示例#2

文件： interpreter.C 项目： ExceptVL/MustRead

main () {


/*
*/
BooleanExp* expression;
Context context;

VariableExp* x = new VariableExp("X");
VariableExp* y = new VariableExp("Y");

expression = new OrExp(
    new AndExp(new Constant(true), x),
    new AndExp(y, new NotExp(x))
);
/*
*/
context.Assign(x, false);
context.Assign(y, true);

bool result = expression->Evaluate(context);
/*
*/
BooleanExp* replacement;
VariableExp* z = new VariableExp("Z");

replacement = new NotExp(z);
expression->Replace("Y", *replacement);

context.Assign(z, true);

result = expression ->Evaluate(context);
/*
*/
}

示例#3

文件： qqq.cpp 项目： ircc/test-code-backup

int main()
{
	BooleanExp* expression,*expression2;
	Context context;
	VariableExp* x = new VariableExp("X");
	VariableExp* y = new VariableExp("Y");
	expression = new OrExp(
		new AndExp(new Constant(true), x),
		new AndExp(y, new NotExp(x)));
	context.Assign(x, false);
	context.Assign(y, true);
	bool result = expression->Evaluate(context);
	cout<<"result: "<<result<<endl;
}

示例#4

文件： Interpreter_exam.cpp 项目： ircc/test-code-backup

int main(int argc, char* argv[])
{
	//生成表达式
	AbstractExpression* expression;
	//解析器对象
	Context context;
	//两个变量
	VariableExp* varX = new VariableExp("keyX");
	VariableExp* varY = new VariableExp("keyY");
	/*一个复杂表达式 或（与（常量，变量），与（变量，非（变量）））*/
	expression = new OrExp(
		new AndExp(new ConstantExp(true), varX),
		new AndExp(varY, new NotExp(varX)));
	//在解析器中建立外部名字和值的关联
	context.Assign(varX, false);
	context.Assign(varY, true);
	//递归运算表达式求值
	bool result = expression->Interpret(context);
	cout<<"result: "<<result<<endl;
	printf("Hello World!\n");
	return 0;
}

示例#5

文件： Application.cpp 项目： bundgaard/GOFIntepreter

int main(int argc, char ** argv)
{
	BooleanExp *expression;
	Context context;
	VariableExp* x = new VariableExp("X");
	VariableExp* y = new VariableExp("Y");

	expression = new OrExp(
		new AndExp(new Constant(true),x),
		new AndExp(y,new NotExp(x)));

	context.Assign(x,false);
	context.Assign(y,true);
	bool result = expression->Evaluate(context);
	char *str;
	if(result == true)
		str = "true";
	else
		str = "false";
	printf("result is %s\n",str);
	system("pause");
	return 0;
}