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为了简洁起见,我想在其显式实例化中只命名一次模板参数,但是我收到了编译器错误。我试图使用在Type alias, alias template
下的cppreference中描述的C++语法。下面是我的示例代码:如何在模板声明中删除重复的模板参数
struct M {};
template< typename T1 >
struct S {};
template< typename T2, typename T3 >
struct N {};
// type alias used to hide a template parameter (from cppreference under 'Type alias, alias template')
//template< typename U1, typename U2 >
//using NN = N< U1, U2<U1> >; // error: attempt at applying alias syntax: error C2947: expecting '>' to terminate template-argument-list, found '<'
int main()
{
N< M, S<M> > nn1; // OK: explicit instantiation with full declaration, but would like to not have to use M twice
// NN< M, S > nn2; // desired declaration, error: error C2947: expecting '>' to terminate template-argument-list, found '<'
return 0;
}
有什么问题吗?