直方图C ++（根）代码中的错误 [英] Error in histogram C++ (root) code

问题描述

我在C ++（root）中有这行代码：

  void  TMTrackAnalyzer :: beginJob（）
 {
 edm :: Service< TFileService> FS; 
 
 dirs_.insert（std :: pair< ObjectType，TFileDirectory *>（InputData，fs-> mkdir（  InputData）））; 
 
} 

基本上填充直方图，设置直方图，标签和标题的范围。实际上我在这个函数中填充了更多的直方图，但为了简单起见我只放了一个。对于他们每个人，我都会遇到这些错误：



预期在''之前的' - ''''''''''''''''''''''''''''''''''''''''''''''''''' '令牌



这些是指（和，在InputData之前和之后.InputData是我想要保存直方图的目录。有谁知道出了什么问题在这里？谢谢！



我的尝试：



我试图谷歌类似但没有找到任何东西，我不知道该怎么做

解决方案

你的 std :: pair 构造错误。您可能希望使用 std :: make_pair 或在传递给 dirs_.insert之前使用变量名明显地创建它（未经测试）：

 std :: pair< ObjectType，TFileDirectory *> mypair（InputData，fs-> mkdir（  InputData）））; 
 dirs_.insert （mypair）; 

另见 pair :: pair - C ++参考 [ ^ ]

I have this line of code in C++ (root):

void TMTrackAnalyzer::beginJob()
{
          edm::Service<TFileService> fs;
                                                                                                   
          dirs_.insert(std::pair< ObjectType, TFileDirectory* >(InputData, fs->mkdir("InputData") ) );
                                                    
}

which basically fills a histogram, sets the range of the histogram, label and title. Actually I fill more histograms in this function, but I put here just one for simplicity. And for each of them I get these errors:

expected primary-expression before '(' token
expected primary-expression before ',' token

These refer to the ( and , before and after InputData. InputData is the directory where I want to save the histograms. Do anyone has any idea what is wrong here? Thank you!

What I have tried:

I tried to google something similar but haven't found anything and I am not sure what to do

解决方案

Your std::pair construction is wrong. You probably want to use std::make_pair or create it explicitely using a variable name before passing to dirs_.insert (untested):

std::pair< ObjectType, TFileDirectory* > mypair (InputData, fs->mkdir("InputData") ) );
dirs_.insert(mypair);

See also pair::pair - C++ Reference[^].

这篇关于直方图C ++（根）代码中的错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！