terryching
317 天前
看看 GPT4 给出的答案：
运行时解析：使用已有的数据结构，如 std::map 或自定义的数据结构，来在运行时模拟结构体。基于解析得到的信息（字段名、类型、数组大小等），你可以动态地存储和访问数据。这种方法牺牲了类型安全和编译时优化，但提供了灵活性。
```c++
#include <iostream>
#include <map>
#include <vector>
#include <string>
#include <typeinfo>
#include <cstdint>
class DynamicStruct {
public:
std::map<std::string, std::vector<uint8_t>> fields;
void addInt(const std::string& name, int value) {
auto data = reinterpret_cast<uint8_t*>(&value);
fields[name] = std::vector<uint8_t>(data, data + sizeof(value));
}
void addDouble(const std::string& name, double value) {
auto data = reinterpret_cast<uint8_t*>(&value);
fields[name] = std::vector<uint8_t>(data, data + sizeof(value));
}
int getInt(const std::string& name) {
if(fields.find(name) != fields.end()) {
auto& data = fields[name];
return *reinterpret_cast<const int*>(data.data());
}
return 0; // Or throw an exception
}
double getDouble(const std::string& name) {
if(fields.find(name) != fields.end()) {
auto& data = fields[name];
return *reinterpret_cast<const double*>(data.data());
}
return 0.0; // Or throw an exception
}
// Similar methods can be added for other types and arrays
};
int main() {
DynamicStruct myStruct;
myStruct.addInt("x", 123);
myStruct.addDouble("y", 456.789);
// For arrays, you might add them element by element or as a block if you know the size
std::cout << "x = " << myStruct.getInt("x") << std::endl;
std::cout << "y = " << myStruct.getDouble("y") << std::endl;
// Accessing array elements would require additional methods
return 0;
}
```