C ++字符串解析（python style） [英] C++ string parsing (python style)

问题描述

我喜欢在python我可以做的像：

  points = [] 
 for line in open （data.txt）：
a，b，c = map（float，line.split（'，'））
 points + = [（a，b，c）] 
  

基本上是读取一行列表，其中每一行表示3D空间中的一个点，点表示为三个数字分开

性能并不是很重要，这个解析只发生一次，因此简单性更重要。

PS我知道这听起来像一个新手的问​​题，但相信我我在D（非常像C ++）写了一个词法分析器，它涉及读取一些文本字符的char和识别代币，

只是这样，回到C ++经过长时间的python，只是让我不想浪费我的时间在这样的事情。

解决方案

d做这样的事情：

  ifstream f（data.txt）; 
 string str 
 while（getline（f，str））{
 Point p; 
 sscanf（str.c_str（），％f，％f，％f \\\
，& p.x，& p.y，& p.z）; 
 points.push_back（p）; 
} 
  

x，y，z必须为浮动。

并包括：

  #include< iostream& 
 #include< fstream> 
  

I love how in python I can do something like:

points = []
for line in open("data.txt"):
    a,b,c = map(float, line.split(','))
    points += [(a,b,c)]

Basically it's reading a list of lines where each one represents a point in 3D space, the point is represented as three numbers separated by commas

How can this be done in C++ without too much headache?

Performance is not very important, this parsing only happens one time, so simplicity is more important.

P.S. I know it sounds like a newbie question, but believe me I've written a lexer in D (pretty much like C++) which involves reading some text char by char and recognizing tokens,
it's just that, coming back to C++ after a long period of python, just makes me not wanna waste my time on such things.

解决方案

I`d do something like this:

ifstream f("data.txt");
string str;
while (getline(f, str)) {
    Point p;
    sscanf(str.c_str(), "%f, %f, %f\n", &p.x, &p.y, &p.z); 
    points.push_back(p);
}

x,y,z must be floats.

And include:

#include <iostream>
#include <fstream>

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