유효하지 않은 변환은

Question

내가이 아직 완료되지 파일 리더/라이터 을 heres 코드를 작성 int로.

#include <iostream> 
#include <fstream> 
#include <string> 

const std::string path_to_data = "\\data"; 
const std::string level_file = path_to_data+"\\level_file.lev"; 



typedef std::string (*f_read)(std::ifstream& fin,const std::string& level_file,int line_num); 
typedef std::string (*f_write)(std::ofstream& fout,const std::string& level_file, std::string& what_to_write,int line_num); 
typedef std::string (*pt_f_manger)(f_read,f_write); 



inline bool is_empty(std::ifstream& pFile){return pFile.peek() ==  std::ifstream::traits_type::eof();} 
std::string file_manger(f_read,f_write); 
std::string read_file(std::ifstream& fin,const std::string& level_file,int line_num); 
std::string write_file(std::ofstream& fout,const std::string& level_file,std::string what_to_write, int line_num); 
std::string error_handler(std::string error_type,pt_f_manger f_manger); 


int main() 
{ 
std::string error = file_manger(read_file,write_file); 
std::cout<<error<<"\n"; 
std::cin.get(); 
std::cin.get(); 
return 0; 
} 

std::string file_manger(f_read f_input,f_write f_output) 
{ 
std::string good = "good"; 
std::string error = "error"; 
std::ifstream fin; 
std::ofstream fout; 
std::string test = "test"; 
std::string output = f_output(fout,level_file,test,0); 
std::string input = f_input(fin,level_file,0); 
if (output != "good") 
    return error; 
if (input != "good") 
    return error; 

return good; 
} 

std::string write_file(std::ofstream& fout,const std::string& level_file, std::string& what_to_write,int line_num) 
{ 
const char* level_filec = level_file.c_str(); 
std::ifstream fin; 
fin.open(level_filec); 
if (fin.is_open()) 
    return "failed to open "+level_file; 

if (is_empty(fin)) 
{ 
    fin.close(); 
    fout.open(level_filec); 
    if (!fout.is_open()) 
     return "failed to open "+level_file; 

    fout<<what_to_write; 
    fout.close(); 
    return "good"; 
} 
int i = 0; 
int num = 0; 
char ch; 
while (fin.good() && i != line_num) 
{ 
    fin.get(ch); 
    if (ch == '\n') 
     ++num; 
    ++i; 
} 
int pos = fin.tellg(); 
fin.close(); 
fout.open(level_filec,std::ios_base::in); 
if (!fout.is_open()) 
    return "failed to open "+level_file; 
fout.seekp(pos); 
fout<<what_to_write; 
fout.close(); 
return "good"; 
    } 

    std::string read_file(std::ifstream& fin,const std::string& level_file,int line_num) 
    { 
    const char* level_filec = level_file.c_str(); 
std::string read; 
fin.open(level_filec); 
if (fin.is_open()) 
    return "failed to open "+level_file; 

if (is_empty(fin)) 
{ 
    fin.close(); 
    return "file is empty"; 
} 
int i = 0; 
int num = 0; 
char ch; 
while (fin.good() && i != line_num) 
{ 
    fin.get(ch); 
    if (ch == '\n') 
     ++num; 
    ++i; 
} 
std::getline(fin,read); 
return read; 
    } 

    std::string error_handler(std::string error_type,pt_f_manger f_manger)//work in progress 
    { 
return "good"; 
    } 

와 나는

C이 오류 : 'INT 주()'기능으로 사용자 \ 존 \ 문서 \ MAIN.CPP || \ : | C : \ 사용자 \ 존 \ 문서 \ MAIN.CPP | 25 | 오류 : 'std :: string (*) (std :: basic_ststream (std :: basic_ofstream)에서 std :: ofstream &, const 문자열 &, std :: string, int) const std :: basic_string &, const std :: basic_string &, std :: basic_string &,, const std :: basic_string &, std :: basic_string, int) int)} '[-fpermissive] | C : \ Users \ john \ Documents \ main.cpp | 17 | error : 'std :: string file_manger (f_read, f_write)'의 인수 2 초기화 중 [-fpermissive] | || === 빌드 완료 : 2 개 오류, 0 개 경고 (0 분, 0 초) === |

메신저는 code :: blocks을 사용합니다.

Answer 1

typedef std::string (*f_write)(
    std::ofstream& fout, const std::string& level_file, 
    std::string& what_to_write, int line_num); 

std::string write_file(
    std::ofstream& fout, const std::string& level_file, 
    std::string what_to_write, int line_num); 

차이점을 발견 할 수 있습니까? (힌트 : 세 번째 매개 변수의 유형 비교).