我对在 C++ 中使用多维 std::initializer_list 有疑问。我有一个 Matrix 类,我希望能够像这样初始化它:
Matrix<int, 3, 3> m({{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
我现在拥有的构造函数采用二维初始化列表的参数,但编译器不喜欢我使用它的方式。这是代码:
template<typename T, unsigned int rows, unsigned int cols>
Matrix<T, rows, cols>::Matrix(std::initializer_list<std::initializer_list<T> > set)
{
std::vector<std::initializer_list<T> > setVec = set;
std::vector<std::vector<T> > v;
for (std::vector<std::initializer_list<T> >::iterator i = setVec.begin(); i != setVec.end(); i++)
{
v.push_back(std::vector<T>(*i));
}
this->matrixData = new T*[rows];
for (unsigned int i = 0; i < rows; i++)
{
this->matrixData[i] = new T[cols];
for (unsigned int j = 0; j < cols; j++)
{
this->matrixData[i][j] = v[i][j];
}
}
}
这是错误:
..\/utils/Matrix.h:138:7: error: need 'typename' before 'std::vector<std::initializer_list<_CharT> >::iterator' because 'std::vector<std::initializer_list<_CharT> >' is a dependent scope
我该如何摆脱这个错误?有没有办法重组它,这样我就不必制作初始化列表或其他东西的丑陋向量?