try to assign dumped string to a class member varible

[DamonsJ]

here is my code :

class A {
public:
void func()
{
nlohmann::json j;
j["a"] = 2.0;

str = j.dump();
}
std::vector<std::string> str;
};

this code give me a crash

why?

[nlohmann]

The return value of j.dump() is a std::string. You try to assign it to a std::vector<std::string>. What do you expect here?