C++ 如何将旧的z3:：expr（Oldvec）更改为新的z3:：expr（Vec）？

我想更改一个旧的z3:：exprOldvec，如下所示：

OldVec is:(and (= (= R4 0) true) (= (= R6 R7) true))

Vec is:(and (= (= R4 0) false) (= (= R6 R7) true))

void changeZ3(z3::expr &OldVec) {
    std::string s="(set-info :status unknown)\n"
                  "(declare-fun R4 () Int)\n"
                  "(declare-fun R7 () Int)\n"
                  "(declare-fun R6 () Int)\n"
                  "(assert\n"
                  " (= (= R4 0) false))\n"
                  "(assert\n"
                  " (= (= R6 R7) true))\n"
                  "(check-sat)";
    std::cout<<"OldVec is:"<<OldVec<<"\n";
    z3::expr Vec=C.parse_string(s.data());
    std::cout<<"Vec is:"<<Vec<<"\n";
    OldVec=Vec;
}

z3::expr Vec = Ctx.parse_file(FormulaFile); //FormulaFile save z3::expr which looked like "s" on the top|^    
changeZ3(Vec);
Solver.add(Vec);

terminate called after throwing an instance of 'z3::exception' 

对于新的z3:：exprVec，如下所示：

OldVec is:(and (= (= R4 0) true) (= (= R6 R7) true))

Vec is:(and (= (= R4 0) false) (= (= R6 R7) true))

void changeZ3(z3::expr &OldVec) {
    std::string s="(set-info :status unknown)\n"
                  "(declare-fun R4 () Int)\n"
                  "(declare-fun R7 () Int)\n"
                  "(declare-fun R6 () Int)\n"
                  "(assert\n"
                  " (= (= R4 0) false))\n"
                  "(assert\n"
                  " (= (= R6 R7) true))\n"
                  "(check-sat)";
    std::cout<<"OldVec is:"<<OldVec<<"\n";
    z3::expr Vec=C.parse_string(s.data());
    std::cout<<"Vec is:"<<Vec<<"\n";
    OldVec=Vec;
}

z3::expr Vec = Ctx.parse_file(FormulaFile); //FormulaFile save z3::expr which looked like "s" on the top|^    
changeZ3(Vec);
Solver.add(Vec);

terminate called after throwing an instance of 'z3::exception' 

我尝试将字符串更改为z3:：expr，如下所示：

OldVec is:(and (= (= R4 0) true) (= (= R6 R7) true))

Vec is:(and (= (= R4 0) false) (= (= R6 R7) true))

void changeZ3(z3::expr &OldVec) {
    std::string s="(set-info :status unknown)\n"
                  "(declare-fun R4 () Int)\n"
                  "(declare-fun R7 () Int)\n"
                  "(declare-fun R6 () Int)\n"
                  "(assert\n"
                  " (= (= R4 0) false))\n"
                  "(assert\n"
                  " (= (= R6 R7) true))\n"
                  "(check-sat)";
    std::cout<<"OldVec is:"<<OldVec<<"\n";
    z3::expr Vec=C.parse_string(s.data());
    std::cout<<"Vec is:"<<Vec<<"\n";
    OldVec=Vec;
}

z3::expr Vec = Ctx.parse_file(FormulaFile); //FormulaFile save z3::expr which looked like "s" on the top|^    
changeZ3(Vec);
Solver.add(Vec);

terminate called after throwing an instance of 'z3::exception' 

changeZ3返回后，我执行了Solver.addVec，如下所示：

OldVec is:(and (= (= R4 0) true) (= (= R6 R7) true))

Vec is:(and (= (= R4 0) false) (= (= R6 R7) true))

void changeZ3(z3::expr &OldVec) {
    std::string s="(set-info :status unknown)\n"
                  "(declare-fun R4 () Int)\n"
                  "(declare-fun R7 () Int)\n"
                  "(declare-fun R6 () Int)\n"
                  "(assert\n"
                  " (= (= R4 0) false))\n"
                  "(assert\n"
                  " (= (= R6 R7) true))\n"
                  "(check-sat)";
    std::cout<<"OldVec is:"<<OldVec<<"\n";
    z3::expr Vec=C.parse_string(s.data());
    std::cout<<"Vec is:"<<Vec<<"\n";
    OldVec=Vec;
}

z3::expr Vec = Ctx.parse_file(FormulaFile); //FormulaFile save z3::expr which looked like "s" on the top|^    
changeZ3(Vec);
Solver.add(Vec);

terminate called after throwing an instance of 'z3::exception' 

然后我在执行Solver.addVec时遇到了一个异常，如下所示：

OldVec is:(and (= (= R4 0) true) (= (= R6 R7) true))

Vec is:(and (= (= R4 0) false) (= (= R6 R7) true))

void changeZ3(z3::expr &OldVec) {
    std::string s="(set-info :status unknown)\n"
                  "(declare-fun R4 () Int)\n"
                  "(declare-fun R7 () Int)\n"
                  "(declare-fun R6 () Int)\n"
                  "(assert\n"
                  " (= (= R4 0) false))\n"
                  "(assert\n"
                  " (= (= R6 R7) true))\n"
                  "(check-sat)";
    std::cout<<"OldVec is:"<<OldVec<<"\n";
    z3::expr Vec=C.parse_string(s.data());
    std::cout<<"Vec is:"<<Vec<<"\n";
    OldVec=Vec;
}

z3::expr Vec = Ctx.parse_file(FormulaFile); //FormulaFile save z3::expr which looked like "s" on the top|^    
changeZ3(Vec);
Solver.add(Vec);

terminate called after throwing an instance of 'z3::exception' 

为什么会这样？是否有其他方法来更改z3:：expr？

通常，需要告知对parse_文件的调用作用域中的排序和声明是什么。也就是说，虽然您成功地在Vec中构造了表达式，但仍然需要在上下文中插入sort Int以及R4、R7和R6的声明

这是z3编程中的一个常见问题：您必须记住，在调用Solver.add时，必须为这些公式适当设置Ctx，以使其有意义

通常，您应该避免像这样解析字符串并将其添加到解算器中。相反，您应该在现有的上下文中工作，并使用表达式AST直接创建表达式