有一个名称空间detail::RayIntersectorHits：
namespace detail {
template<typename AVertexType, typename AIndexedFaceType, typename ATreeType, typename AVectorType>
struct RayIntersector {
using VertexType = AVertexType;
using IndexedFaceType = AIndexedFaceType;
using TreeType = ATreeType;
using VectorType = AVectorType;
const std::vector<VertexType> &vertices;
const std::vector<IndexedFaceType> &faces;
const TreeType &tree;
const VectorType origin;
const VectorType dir;
const VectorType invdir;
};
template<typename VertexType, typename IndexedFaceType, typename TreeType, typename VectorType>
struct RayIntersectorHits : RayIntersector<VertexType, IndexedFaceType, TreeType, VectorType> {
std::vector<igl::Hit> hits;
}
}
我正在这样使用detail::RayIntersectorHits：
template<typename VertexType, typename IndexedFaceType, typename TreeType, typename VectorType>
inline bool intersect_ray_all_hits(/* input agrs */)
{
auto ray_intersector = detail::RayIntersectorHits<VertexType, IndexedFaceType, TreeType, VectorType> {
vertices, faces, tree,
origin, dir, VectorType(dir.cwiseInverse())
};
// ...
}
但是我收到此编译错误：
error: no matching constructor for initialization of 'detail::RayIntersectorHits<Matrix<float, 3, 1, 2, 3, 1>, Matrix<int, 3, 1, 2, 3, 1>, Tree<3, float>, Matrix<double, 3, 1, 2, 3, 1> >'
auto ray_intersector = detail::RayIntersectorHits<VertexType, IndexedFaceType, TreeType, VectorType> {
^ ~
我不知道如何绕过错误。感谢您的帮助。
错误已通过以下方式解决：
namespace detail {
template<typename AVertexType, typename AIndexedFaceType, typename ATreeType, typename AVectorType>
struct RayIntersector {
using VertexType = AVertexType;
using IndexedFaceType = AIndexedFaceType;
using TreeType = ATreeType;
using VectorType = AVectorType;
const std::vector<VertexType> &vertices;
const std::vector<IndexedFaceType> &faces;
const TreeType &tree;
const VectorType origin;
const VectorType dir;
const VectorType invdir;
#ifdef CPP17_NOT_AVAILABLE
// Aggregate initialization for the derived type is a C++17 feature
// Trying to compile with C++14
// If you can't upgrade to C++17 standard, you will need to define a constructor in the derived struct.
RayIntersector(const std::vector<VertexType> &vertices
, const std::vector<IndexedFaceType> &faces
, const TreeType &tree
, const VectorType origin
, const VectorType dir
, const VectorType invdir)
:
vertices(vertices)
, faces(faces)
, tree(tree)
, origin(origin)
, dir(dir)
, invdir(invdir)
{}
#endif // CPP17_NOT_AVAILABLE
};
template<typename VertexType, typename IndexedFaceType, typename TreeType, typename VectorType>
struct RayIntersectorHits : RayIntersector<VertexType, IndexedFaceType, TreeType, VectorType> {
std::vector<igl::Hit> hits;
#ifdef CPP17_NOT_AVAILABLE
// Aggregate initialization for the derived type is a C++17 feature
// Trying to compile with C++14
// If you can't upgrade to C++17 standard, you will need to define a constructor in the derived struct.
RayIntersectorHits(const std::vector<VertexType> &vertices
, const std::vector<IndexedFaceType> &faces
, const TreeType &tree
, const VectorType origin
, const VectorType dir
, const VectorType invdir)
: RayIntersector<VertexType, IndexedFaceType, TreeType, VectorType>(vertices, faces, tree, origin, dir, invdir) {}
#endif // CPP17_NOT_AVAILABLE
};
} // namespace detail
您已经定义了没有任何用户定义的构造函数的聚合结构。您可以struct RayIntersector使用聚合初始化进行初始化：
struct A
{
public:
int a;
int b;
};
struct B: public A
{
int c;
};
void func()
{
auto varA = A{1,2}; // Compiles with C++14
auto varB = B{2,3,4}; // Compiles with C++17
}
但是派生类型的聚合初始化是C ++ 17的功能：
聚合初始化的效果是：
从类定义中的数组下标/外观顺序开始，每个直接的公共基础（自C ++ 17起）数组元素或非静态类成员都从初始化程序列表的相应子句中进行复制初始化。
如果无法升级到C ++ 17标准，则需要在派生的struct中定义一个构造函数。
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