[英]Partial specialization for one method in the class
I have a template matrix class.我有一个模板矩阵 class。 I try to implement the size (always square) as a template parameter.我尝试将大小(始终为正方形)实现为模板参数。
template<
// Type of data
typename type_t,
// dimension of the matrix 4 -> 4x4
std::size_t dim_t,
// I don't want a matrix of non numeric value
typename = typename std::enable_if_t< std::is_arithmetic_v< type_t >, type_t >
>
class Matrix final
{
// ....
}
With this code, I would like to be able to make a different method for different sizes of matrix.使用此代码,我希望能够为不同大小的矩阵制作不同的方法。 Because some method force me to take it account without going in to dark code...因为某些方法迫使我在不进入暗码的情况下考虑它......
// For instance
void doSomething (void);
Is there a way like the following to be used?有没有类似下面的方法可以使用? Because I saw a lot of example and I have always an error.因为我看到了很多例子,我总是出错。 I use C++17 and GCC.我使用 C++17 和 GCC。 The final idea is to have only a header file.最后的想法是只有一个 header 文件。
template<
typename type_t,
std::size_t dim_t,
typename = typename std::enable_if_t< std::is_arithmetic_v< type_t >, type_t >
>
class Matrix final
{
// ...
// Specialization for matrix 4x4
template < typename type_t >
void doSomething< type_t, 4 > (void)
{
// Specific code for matrix 4x4.
}
// ...
}
You might use SFINAE:您可以使用 SFINAE:
template<
typename type_t,
std::size_t dim_t,
typename = typename std::enable_if_t< std::is_arithmetic_v< type_t >, type_t >
>
class Matrix final
{
// ...
// Specialization for matrix 4x4
template <std::size_t N = dim_t, std::enable_if_t<N == 4, int> = 0>
void doSomething()
{
// Specific code for matrix 4x4.
}
// ...
};
C++20 would allow requires
for better syntax: C++20 将允许requires
更好的语法:
template<
typename type_t,
std::size_t dim_t,
typename = typename std::enable_if_t< std::is_arithmetic_v< type_t >, type_t >
>
class Matrix final
{
// ...
// Specialization for matrix 4x4
void doSomething() requires(dim_t == 4)
{
// Specific code for matrix 4x4.
}
// ...
};
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