c++ - "No matching function for call to"模板 C++

Question

帮助 我不明白为什么我不能运行这段用于家庭作业的代码片段，而且当 xCode 说我没有定义该函数时，它似乎不同意我的看法。请参阅下面的主要错误

template <class Comparable>
Comparable maxSubsequenceSum1( const vector<Comparable> & a, int & seqStart, int & seqEnd){
        int n = a.size( );
        Comparable maxSum = 0;

        for( int i = 0; i < n; i++ )
            for( int j = i; j < n; j++ )
            {
                Comparable thisSum = 0;
                for( int k = i; k <= j; k++ )
                    thisSum += a[ k ];

                if( thisSum > maxSum )
                {
                    maxSum = thisSum;
                    seqStart = i;
                    seqEnd = j;
                }
            }

        return maxSum;

}



int main(){


        vector<int> vectorofints;
        vectorofints.resize(128);
        for (int i=0; i<vectorofints.size(); i++){
            vectorofints[i] = (rand() % 2001) - 1000;
        }
        maxSubsequenceSum1(vectorofints, 0, 127) //**---->the error i get in xcode is "No matching function for call to maxSubsequenceSum1"

        return 0;
}

Answer 1

更改签名

Comparable maxSubsequenceSum1( const vector<Comparable> & a,
                               int & seqStart, int & seqEnd)

到

Comparable maxSubsequenceSum1( const vector<Comparable> & a, 
                                 int seqStart, int seqEnd)

如果您执行 int & i = 0;，也会出现同样的问题。您不能从右值初始化非常量引用。 0 和 127 是在表达式末尾过期的临时对象，临时对象不能绑定(bind)到非常量引用。