是否有可能在编译时不知道模板类型

Question

Suppose I have a class: 假设我有一堂课：

template <unsigned M, unsigned N, typename T = float>
class Matrix
{};

I want to read from a file which contains matrices of some unknown M,N and create the above type: 我想从包含某些未知M，N矩阵的文件中读取并创建上述类型：

Matrix getMatrixFromFile(std::string &path); 矩阵getMatrixFromFile（std :: string＆path）;

Is this possible given that M, N are not known at compile time? 鉴于在编译时不知道M，N，这可能吗？

Answer 1

The answer is no. 答案是不。

The templates parameters are used to create types at compile time based on the types passed. 模板参数用于在编译时根据传递的类型创建类型。