错误:重新定义默认参数

Question

我有两种方法可以实现: Compute_correlation和cca。我就是这样定义它们的：

namespace dlib
{
     template <typename T>matrix<typename T::type,0,1> compute_correlations (
        const matrix_exp<T>& L,
        const matrix_exp<T>& R
       );

      template <typename T>matrix<T,0,1> cca (
        const matrix<T>& L,
        const matrix<T>& R,
        matrix<T>& Ltrans,
        matrix<T>& Rtrans,
        unsigned long num_correlations,
        unsigned long extra_rank = 5,
        unsigned long q = 2,
        double regularization = 0
       );

    int _tmain(int argc, _TCHAR* argv[]) {...}
    template <
        typename T
        >
    matrix<typename T::type,0,1> compute_correlations (
        const matrix_exp<T>& L,
        const matrix_exp<T>& R
    )
    {
        DLIB_ASSERT( L.size() > 0 && R.size() > 0 && L.nr() == R.nr(), 
            "\t matrix compute_correlations()"
            << "\n\t Invalid inputs were given to this function."
            << "\n\t L.size(): " << L.size()
            << "\n\t R.size(): " << R.size()
            << "\n\t L.nr():   " << L.nr()
            << "\n\t R.nr():   " << R.nr()
            );

        typedef typename T::type type;
        matrix<type> A, B, C;
        A = diag(trans(R)*L);
        B = sqrt(diag(trans(L)*L));
        C = sqrt(diag(trans(R)*R));
        A = pointwise_multiply(A , reciprocal(pointwise_multiply(B,C)));
        return A;
    }

    template <typename T>
    matrix<T,0,1> cca (
        const matrix<T>& L,
        const matrix<T>& R,
        matrix<T>& Ltrans,
        matrix<T>& Rtrans,
        unsigned long num_correlations,
        unsigned long extra_rank = 5,
        unsigned long q = 2,
        double regularization = 0
    )
    {
        DLIB_ASSERT( num_correlations > 0 && L.size() > 0 && R.size() > 0 && L.nr() == R.nr() &&
            regularization >= 0, 
            "\t matrix cca()"
            << "\n\t Invalid inputs were given to this function."
            << "\n\t num_correlations: " << num_correlations 
            << "\n\t regularization:   " << regularization 
            << "\n\t L.size(): " << L.size()
            << "\n\t R.size(): " << R.size()
            << "\n\t L.nr():   " << L.nr()
            << "\n\t R.nr():   " << R.nr()
            );

        using std::min;
        const unsigned long n = min(num_correlations, (unsigned long)min(R.nr(),min(L.nc(), R.nc())));
        return impl_cca(L,R,Ltrans, Rtrans, num_correlations, extra_rank, q, n, regularization); 
    }

我正在尝试从main实现它们，但是显示了以下错误:重新定义默认参数。请帮帮我

Answer 1

只需从函数定义的参数列表中删除默认参数的赋值即可。

Answer 2

您应该只在声明中设置默认参数，而不是在定义(实现)中设置默认参数。在您的示例中，删除= 0部件在函数实现中出现的位置。

The compiler is complaining about my default parameters?