我想在Array.cpp文件中定义getRawDataPtr()函数，我实现如下，我有2个错误
//file Array.cpp
template<typename T>
void * const math::Array<T>::getRawDataPtr
{
return buffer;
}
//file Array.h
#ifndef _ARRAY_
#define _ARRAY_
namespace math
{
//---------------------------------------------------------------------------------------------
// Do NOT modify this section. For the implementation, see comment below the class declaration
//---------------------------------------------------------------------------------------------
/*! The Array class implements a generic two-dimensional array of elements of type T.
*/
template <typename T>
class Array
{
protected:
//! Flat storage of the elements of the array of type T
T * buffer;
//! The width of the array (number of columns)
unsigned int width,
//! The height of the array (number of rows)
height;
public:
/*! Reports the width (columns) of the array
*
* \return the width.
*/
unsigned int getWidth() const { return width; }
/*! Reports the height (rows) of the array
*
* \return the height.
*/
unsigned int getHeight() const { return height; }
/*! Obtains a constant pointer to the internal data.
*
* This is NOT a copy of the internal array data, but rather a pointer
* to the internally allocated space.
*/
void * const getRawDataPtr();
/*! Returns a reference to the element at the zero-based position (column x, row y).
*
* \param x is the zero-based column index of the array.
* \param y is the zero-based row index of the array.
*
* \return a reference to the element at position (x,y)
*/
T & operator () (int x, int y);
/*! Returns a constant reference to the element at the zero-based position (column x, row y).
*
* \param x is the zero-based column index of the array.
* \param y is the zero-based row index of the array.
*
* \return a reference to the element at position (x,y)
*/
const T & operator () (int x, int y) const;
/*! Constructor with array size.
*
* No default constructor is provided as it makes no sense.
*
* \param w is the width (columns) of the array
* \param h is the height (rows) of the array
*/
Array(unsigned int w, unsigned int h);
/*! Copy constructor.
*
* No default constructor is provided as it makes no sense.
*
* \param source is the array to replicate.
*/
Array(const Array<T> & source);
/*! Copy assignment operator
*
* \param source is the array to replicate.
*/
Array & operator = (const Array<T> & source);
/*! Equality operator.
*
* \param right is the array to compare the current object to.
*
* \return true if the current array and the source have the same dimensions AND
* one by one their elements of type T are the same.
*/
bool operator == (const Array<T> & right) const;
/*! Changes the internal array data storage size.
*
* If the one or both of the given dimensions are smaller, the array should be clipped
* by discarding the remaining elements in the rows and/or columns outside the margins.
* If the new dimensions are larger, pad the old elements with default values of type T.
* If the array is not yet allocated (zero width and height), allocate the internal buffer and
* set the array size according to the given dimensions.
*
* \param new_width is the user-provided width to resize the array to.
* \param new_height is the user-provided height to resize the array to.
*/
void resize(unsigned int new_width, unsigned int new_height);
/*! Virtual destructor.
*/
virtual ~Array();
};
//---------------------------------------------------------------------------------------------
// Do NOT add the member function implementation here. Add all implementations in the Array.hpp
// file included below. The two files will be concatenated upon preprocessing.
//---------------------------------------------------------------------------------------------
} // namespace math
#include "Array.hpp"
#endif//------------------------------------------------------------
答案 0 :(得分：0)
我认为你有一个正确包含的问题（见下文）以及你忘记getRawDataPtr()定义中括号的明显事实。我的意思是：你应该写
// parentheses added -----> vv
void * const math::Array<T>::getRawDataPtr ()
{
return buffer;
}
关于包含...你的“array.h”包括“array.hpp”，但getRawDataPtr()在“array.cpp”中实现。
您是否将“array.hpp”与“array.cpp”混淆了？
我能说的是以下代码编译没有错误
namespace math
{
template <typename T>
class Array
{
protected:
T * buffer;
unsigned int width, height;
public:
unsigned int getWidth() const { return width; }
unsigned int getHeight() const { return height; }
void * const getRawDataPtr();
T & operator () (int x, int y);
const T & operator () (int x, int y) const;
Array(unsigned int w, unsigned int h);
Array(const Array<T> & source);
Array & operator = (const Array<T> & source);
bool operator == (const Array<T> & right) const;
void resize(unsigned int new_width, unsigned int new_height);
virtual ~Array();
};
} // namespace math
template<typename T>
void * const math::Array<T>::getRawDataPtr ()
{ return buffer; }
int main ()
{ }