我正在尝试从我的主管那里调试这段代码，我是C++新手。
我发现了一些类似的no matching function for call to问题，这些问题给了我问题可能是什么的想法，但无法解决它。
我在错误消息和相关功能下面列出了我的想法。
错误信息：
In function ‘int main(int, char**)’:
distanceMatrixToSageGraph.c:104:43: error: no matching function for call to
‘std::vector<std::vector<int>>::push_back(std::vector<std::__cxx11::basic_string<char> >&)’
the_entries.push_back( row_as_vector );
相关功能：
int main(int argc, char** threshold_and_distanceMatrixfilename)
{
if (argc < 2 || argc > 2)
{
std::cerr << "Usage: ./distanceMatrixToSageGraph.o <threshold>
<distanceMatrix_file_calculated_fromDGEsingleCell_data>" << std::endl;
return -1;
}
string distanceMatrixfilename = threshold_and_distanceMatrixfilename[2];
int threshold = std::stoi(threshold_and_distanceMatrixfilename[1]);
std::ifstream distanceMatrixFile(distanceMatrixfilename);
if (!distanceMatrixFile)
{
std::cerr << "Error opening distanceMatrix file: " << distanceMatrixfilename << std::endl;
return -1;
}
string row;
std::getline(distanceMatrixFile, row); // discard the first row, which specifies the format of the file.
vector<vector<int>> the_entries;
while (std::getline(distanceMatrixFile, row))
{
std::stringstream row_as_stringstream(row);
int i; i = 0;
vector<string> row_as_vector;
while (row_as_stringstream.good())
{
string substr;
getline(row_as_stringstream, substr, ',');
row_as_vector.push_back(substr);
};
the_entries.push_back(row_as_vector); //LINE 104
};
}
想法：
- 如果有人能向我解释，那就太好了：
std::vector<std::vector<int>>::push_back(std::vector<std::__cxx11::basic_string<char>>&) - 我知道
std::vector<std::vector<int>>是一个矩阵， 该push_back在向量的末尾添加一个元素。 - 我怀疑我们试图以错误的类型读取
the_entries.push-back(row_as_vector). 原始代码将一个
csv文件作为输入，其中包含integers和strings.现在我们正在读取一个具有以下形状的txt文件：TEXT 0; INT; INT; INT; INT; ... 0; INT; INT; INT; INT; ... 18 more lines of the above numbers and semicolons在上面，我们删除了第
89行中的第一行。是否有可能必须对代码进行更多更改才能 读取此
txt文件而不是csv文件？
错误消息的其余部分：
In file included from /usr/include/c++/6/vector:64:0,
from distanceMatrixToSageGraph.c:13:
/usr/include/c++/6/bits/stl_vector.h:914:7: note: candidate: void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::value_type = std::vector<int>]
push_back(const value_type& __x)
^~~~~~~~~
/usr/include/c++/6/bits/stl_vector.h:914:7: note: no known conversion for argument 1 from ‘std::vector<std::__cxx11::basic_string<char> >’ to ‘const value_type& {aka const std::vector<int>&}’
/usr/include/c++/6/bits/stl_vector.h:932:7: note: candidate: void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::value_type = std::vector<int>]
push_back(value_type&& __x)
^~~~~~~~~
/usr/include/c++/6/bits/stl_vector.h:932:7: note: no known conversion for argument 1 from ‘std::vector<std::__cxx11::basic_string<char> >’ to ‘std::vector<std::vector<int> >::value_type&& {aka std::vector<int>&&}’
整个代码：
// Convert distanceMatrix tables of protein interactions to SAGE graph.
///////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <fstream>
#include <sstream>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <list>
#include <vector>
#include <tuple>
#include <algorithm>
using namespace std;
void writeGraphInSageFormat(string name, std::vector<std::vector<int>> TheEdges)
{
//////////////////////////////////////////////////////////////////////////////////////
// Write out the edges in SAGE format.
///////////////////////////////////////////////////////////////////////////////////////
int edgeNumber = TheEdges.size();
ofstream d1sageFile(name, ios::out);
d1sageFile << "g = Graph([" << endl;
for (int n = 0; n < edgeNumber; n++) {
d1sageFile << "(" << TheEdges[n][0] + 1 << "," << TheEdges[n][1] + 1 << ")," << endl;
}
d1sageFile << "])" << endl;
d1sageFile << "g.show()" << endl;
d1sageFile.close();
std::cout << "SAGE graph written into the file " << name << std::endl;
}
std::vector<std::vector<int>> ConvertEntriesMatrixToEdges(vector<vector<int>> the_entries, int threshold)
{
////////////////////////////////////////////////////////////////////////////////////////////
// Construct the edge-vertex incidence matrix (d_1) from the distanceMatrix entries matrix:
////////////////////////////////////////////////////////////////////////////////////////////
std::vector<std::string> proteinNames;
std::vector<std::vector<int>> TheEdges;
std::cout << "Registering only edges shorter than " << threshold << "." << std::endl;
int thisDistance;
for (int i = 0; i < the_entries.size(); i++)
{
for (int j = i + 1; j < the_entries.size(); j++)
{
// we could use the_entries.size() instead of the_entries.at(i).size(), because this is a square matrix.
thisDistance = the_entries.at(i).at(j);
if (thisDistance < threshold)
{
std::vector<int> CurrentEdge(2);
CurrentEdge[0] = i;
CurrentEdge[1] = j;
TheEdges.push_back(CurrentEdge);
};
};
};
return TheEdges;
}
///////////////////////////////////////////
// Main Program: Extract edges from a distanceMatrix file.
///////////////////////////////////////////
int main(int argc, char** threshold_and_distanceMatrixfilename)
{
if (argc < 2 || argc > 2)
{
std::cerr << "Usage: ./distanceMatrixToSageGraph.o <threshold> <distanceMatrix_file_calculated_fromDGEsingleCell_data>" << std::endl;
return -1;
}
string distanceMatrixfilename = threshold_and_distanceMatrixfilename[2];
int threshold = std::stoi(threshold_and_distanceMatrixfilename[1]);
std::ifstream distanceMatrixFile(distanceMatrixfilename);
if (!distanceMatrixFile) {
std::cerr << "Error opening distanceMatrix file: " << distanceMatrixfilename << std::endl;
return -1;
}
string row; //LINE 88
std::getline(distanceMatrixFile, row); // discard the first row, which specifies the format of the file.
vector<vector<int>> the_entries;
while (std::getline(distanceMatrixFile, row))
{
std::stringstream row_as_stringstream(row);
int i; i = 0;
vector<string> row_as_vector;
while (row_as_stringstream.good())
{
string substr;
getline(row_as_stringstream, substr, ',');
row_as_vector.push_back(substr);
};
the_entries.push_back(row_as_vector); //LINE 104
};
////////////////////////////////////////////////////////////
// Now we assemble the entries to an edges matrix, and write it into a Sage file:
////////////////////////////////////////////////////////////
std::vector<std::vector<int>> TheEdges = ConvertEntriesMatrixToEdges(the_entries, threshold);
char outputFilename[60]; strcpy(outputFilename, distanceMatrixfilename.c_str()); strcat(outputFilename, "AtThreshold"); string thrshld = std::to_string(threshold); strcat(outputFilename, thrshld.c_str()); strcat(outputFilename, ".txt");
writeGraphInSageFormat(outputFilename, TheEdges);
return 0;
}
我怀疑我们试图以错误的类型读取 the_entries.推回(row_as_vector)
error: no matching function for call to
‘std::vector<std::vector<int>>::push_back(std::vector<std::__cxx11::basic_string<char> >&)’
the_entries.push_back( row_as_vector );
是的，你对此的权利。错误消息指出您正在尝试将字符串向量推回整数向量。它们是完全不同的类型，因此不可能。
您可能希望将the_entries类型更改为
std::vector<std::vector<std::string>> the_entries;
// ^^^^^^^^^^^^
或
使用std::stoi将字符串转换为整数，同时推回std::vector<int> row_as_vector。
std::vector<int> row_as_vector;
while(row_as_stringstream.good())
{
// ......
row_as_vector.push_back(std::stoi(substr));
// ^^^^^^^^^^^^^^^^^^^
};
the_entries.push_back( row_as_vector );
是否有可能必须对代码进行更多更改才能阅读 这个
txt文件而不是csv文件？
如果这两者的内容相同，则无需在代码中产生太大差异。但是，;应在调用std::stoi之前解析出来。因为它可能通过invalid_argument坏论点的例外。
几点建议：
- 考虑不要和
using namespace std;一起练习。看这篇文章 欲了解更多信息： 为什么是"使用命名空间 std;"被认为是不良做法？ - 当您传递非基元类型(即
std::string，std::vector..等)到函数，考虑情况，如果 参数是否为只读。是否应修改数据按引用传递，如果是只读的(不应在函数内部进行任何修改)，则通过const-ref传递它们。阅读更多： 如何在C++中将对象传递给函数？