C++ std::any升级为SafeAny

本文作者原创，首发在本博客；CSDN 上的同名文章已标注为转载并回链到本页：https://blog.csdn.net/qq_30220519/article/details/142467188

std::any测试

#include <any>

class A {
public:
	int8_t a;
};

int main(int argc, char* argv[]) {
	std::any num((int8_t)42);
	auto a = std::any_cast<A>(num);
	return 0;
}

异常： 0x00007FFA9385CD29 处(位于 test.exe 中)有未经处理的异常: Microsoft C++ 异常: std::bad_any_cast，位于内存位置 0x000000882B96FC50 处。

SafeAny测试

#include "SafeAny/safe_any.hpp"

class A {
public:
	int8_t a;
};

int main(int argc, char* argv[]) {
    Any num( (int8_t) 42 );
    auto a = num.cast<A>();
}

 异常：D:\SafeCppAny\test.cpp:12: Failure: due to unexpected exception with message: [Any::convert]: no known safe conversion between __int64 and class A

优点

SafeAny比std::any增加了错误位置，错误类型转换说明，方便问题定位

参考

GitHub - facontidavide/SafeCppAny: Extension of std::any with small object optmization and safe numeric conversion.

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