读完整文件到std::string的两种方法

<1>

#include<iostream>#include <fstream> std::ifstream in("filepath");  std::istreambuf_iterator<char> beg(in), end;  std::string str(beg, end);

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 <2>

#include<iostream>#include <fstream>#include <sstream>

std::ifstream in("filepath"); std::ostringstream oss; oss<< in.rdbuf(); std::string str = tmp.str();