Question

LASReader.h

class LASReader
{

public:

LASReader();
~LASReader();

Point3 (LASReader::*GetPoint)();

private:

Point3 GetPointF0();
Point3 GetPointF1();
Point3 GetPointF2();
Point3 GetPointF3();
Point3 GetPointF4();
Point3 GetPointF5();
};

LASReader.cpp

switch (m_header.PointDataFormat)
{
case 0:
    m_formatSize = sizeof(LASPOINTF0);
    GetPoint = &LASReader::GetPointF0;
    break;
case 1:
    m_formatSize = sizeof(LASPOINTF1);
    GetPoint = &LASReader::GetPointF1;
    break;
case 2:
    m_formatSize = sizeof(LASPOINTF2);
    GetPoint = &LASReader::GetPointF2;
    break;
case 3:
    m_formatSize = sizeof(LASPOINTF3);
    GetPoint = &LASReader::GetPointF3;
    break;
case 4:
    m_formatSize = sizeof(LASPOINTF4);
    GetPoint = &LASReader::GetPointF4;
    break;
case 5:
    m_formatSize = sizeof(LASPOINTF5);
    GetPoint = &LASReader::GetPointF5;
    break;
default:
    break;  // Unknown Point Data Format
}

的main.cpp

Point3 p = reader->GetPoint;

“错误C2440：'初始化'：无法从'Point3（__cdecl LASReader :: *）（void）'转换为'Point3'”

当我使用手镯时

Point3 p = reader->GetPoint();

“错误C2064：术语不评估为采用0参数的函数”

我做错了什么？

Answer 1

您需要使用(reader->*reader->GetPoint)()来调用它。见How to invoke pointer to member function when it's a class data member?

Answer 2

函数指针语法如下

returnType (*yourFuncName)(argumentTypes);

因此您需要将您的会员重新定义为此类

Point3 (*getPointFunc)(void);

VC ++函数指针类

2 个答案: