cai-jinlin commented on PR #59014:
URL: https://github.com/apache/doris/pull/59014#issuecomment-3663346499
#ifndef CORE_HPP
#define CORE_HPP
#include <string>
// 核心计算函数
inline int64_t hamming_calc(const std::string& s1, const std::string& s2) {
if (s1.length() != s2.length()) {
throw std::runtime_error("length mismatch");
}
int64_t diff = 0;
for (size_t i = 0; i < s1.length(); i++) {
if (s1[i] != s2[i]) diff++;
}
return diff;
}
#endif
//选择能抛出异常的模版
#ifndef TEMPLATE_HPP
#define TEMPLATE_HPP
class FunctionBinaryToType {
public:
static int64_t call(const std::string& s1, const std::string& s2) {
// 这里起作用：它会调用核心函数
// 如果 hamming_calc 抛出异常，这里会让异常继续传播
return hamming_calc(s1, s2);
}
};
// 选择模板：这里 FunctionBinaryToType 被选中
using HammingDistance = FunctionBinaryToType;
#endif
//测试代码
#include <iostream>
#include "template.hpp"
// 用户调用的函数
int64_t hamming_distance(const std::string& s1, const std::string& s2) {
return HammingDistance::call(s1, s2);
}
int main() {
// 正常情况
std::cout << "1. 正常调用: ";
try {
int64_t r = hamming_distance("abc", "abc");
std::cout << "结果 = " << r << "\n";
} catch (...) {
std::cout << "抛出异常\n";
}
// 错误情况
std::cout << "\n2. 长度不同: ";
try {
int64_t r = hamming_distance("abc", "abcd");
std::cout << "结果 = " << r << "\n";
} catch (const std::exception& e) {
std::cout << "抛出异常: " << e.what() << "\n";
}
std::cout << "\nFunctionBinaryToType 的作用：传递异常\n";
return 0;
}
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