2016-07-23 274 views
0

在發佈前最後一次檢查問題時已經解決了這個問題,但調試看起來有點不好(至少對於新手來說),所以我會發布無論如何 - 隨意刪除。std :: ofstream無法將std :: string寫入文件

問題是,在下面的標記行中,ofstream似乎無法寫出一個簡單的字符串;模板似乎是這個問題:

template <typename T> 
void appendVectorToCSV(const std::string& header, std::vector<T> row, 
     const std::string& outfilename){ 
    std::ofstream fout(outfilename); 
    fout << header;// << ","; /* The error line 80 */ 
    ... 

這給了錯誤:

varUtils.hpp: In function ‘void appendVectorToCSV(std::string&, const std::vector<_RealType>&, const string&)’: 
varUtils.hpp:80:10: error: no match for ‘operator<<’ (operand types are ‘std::ofstream {aka std::basic_ofstream<char>}’ and ‘std::string {aka std::basic_string<char>}’) 
    fout << header;// << ","; 
     ^
varUtils.hpp:80:10: note: candidates are: 
... 
/usr/include/c++/4.8/complex:524:5: note: template<class _Tp, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::complex<_Tp>&) 
    operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x) 
    ^
/usr/include/c++/4.8/complex:524:5: note: template argument deduction/substitution failed: 
... 
varUtils.hpp:80:13: note: ‘std::ofstream {aka std::basic_ofstream<char>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’ 
    fout << header;// << ","; 
      ^
+0

你應該留下你的問題一個問題,然後自己回答。 – melpomene

+0

完成。當然,這更容易閱讀。 – dasWesen

回答

2

所以,解決方法: 如果丟失一個頭。

#include <iostream> 

已經在那裏了,但不是

#include <fstream> 
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