小编som*_*one的帖子

我正在尝试按照 repo>settings>Actions>add runner 中描述的步骤在我的 Linux 机器（Ubuntu 20.04.1 LTS）上安装一个 GitHub 运行器。第一步工作正常，但是当我运行配置时：

./config.sh --url <repo URL> --token <token>

我收到以下失败消息：

ldd: ./bin/libSystem.Security.Cryptography.Native.OpenSsl.so: No such file or directory
ldd: ./bin/libSystem.IO.Compression.Native.so: No such file or directory
touch: cannot touch '.env': Permission denied
./env.sh: line 37: .path: Permission denied
./env.sh: line 32: .env: Permission denied
Unhandled exception. System.UnauthorizedAccessException: Access to the path '/actions-runner/_diag' is denied.
 ---> System.IO.IOException: Permission denied
   --- End of inner exception stack trace ---
   at System.IO.FileSystem.CreateDirectory(String fullPath)
   at System.IO.Directory.CreateDirectory(String path)
   at GitHub.Runner.Common.HostTraceListener..ctor(String logFileDirectory, …

那里！

有没有办法递归地声明一个类型？我快到了，但出现编译错误。

我正在设计一个简单的模板来确定用于存储操作混合类型内容的结果的最佳类型。

OP_T<> 用例示例：

typename OP_T<char, float, int>::M var //var is actually a float

代码

template <typename ...T>
struct OP_T{};

template <typename T0, typename T1>
struct OP_T<T0, T1> {
    using M = typename x_traits<T0, T1>::MULT_T;
};

template <typename T0, typename ...Ts>
struct OP_T<T0, Ts...> {
    using M = typename OP_T<T0, Ts...>::M; // error: 'M' is not a member of 'OP_T' 
};

这是简化的 x_traits

template<typename T>
struct x_traits_default {
    typedef T MULT_T;
};

template<typename T1, typename T2>
struct x_traits {}; …