c++ - cpp使用 vector 编译错误初始化二维数组

Question

我想在构造函数中使用初始化列表来初始化二维数组 m_field。 喜欢这个线程 Creating 2-dimensional vector in class C++ ，但我收到下面列出的错误。

BoardData.h

#ifndef BOARDDATA_H
#define BOARDDATA_H

#include <vector>

class BoardData
{
    public:
    /** Default constructor */
    BoardData(int rows, int cols);
    /** Default destructor */
    virtual ~BoardData();
    protected:
    private:
    std::vector< std:vector<int> > m_field;

};


#endif // BOARDDATA_H

BoardData.cpp

#include "BoardData.h"

BoardData::BoardData(int rows, int cols) :
                     m_field(rows, std::vector<int>(cols,0))
{
    //ctor
}

BoardData::~BoardData()
{
    //dtor
}

编译器输出:(gcc 版本 4.6.3)

BoardData.h|18|error: template argument 1 is invalid|
BoardData.h|18|error: template argument 2 is invalid|
BoardData.cpp||In constructor ‘BoardData::BoardData(int, int)’:|
BoardData.cpp|4|error: expression list treated as compound expression in mem-initializer [-fpermissive]|
BoardData.cpp|4|warning: left operand of comma operator has no effect [-Wunused-value]|
BoardData.cpp|4|error: cannot convert ‘std::vector<int>’ to ‘int’ in initialization|
||=== Build finished: 4 errors, 1 warnings ===|

Answer 1

std::vector< std:vector<int> > m_field;

应该是

std::vector< std::vector<int> > m_field;
                 ^

不是很有用的错误信息，我同意...