当不使用operator new时，C ++程序在std :: bad_alloc之后终止

Question

根据cplusplus.com对std :: bad_alloc

的说法

  

当operator new和operator new []的标准定义未能分配所请求的存储空间时抛出的异常类型。

但是，在我的代码中，不使用new运算符：

#include <iostream>
#include <boost/filesystem.hpp>
#include <cstdint>

using namespace std;
using namespace boost::filesystem;

int main()
{
  path p{};

  std::cin >> p;

  if (exists(p))    // does p actually exist?
  {
    if (is_regular_file(p))        // is p a regular file?
      cout << p << " size is " << file_size(p) << '\n';

    else if (is_directory(p))      // is p a directory?
      cout << p << "is a directory\n";

    else
      cout << p << "exists, but is neither a regular file nor a directory\n";
  }
  else
    cout << p << "does not exist\n";

  return 0;
}

（来自boost文件系统教程的代码）

然而控制台说：

terminate called after throwing an instance of 'std::bad_alloc'
  what(): std::bad_alloc
Aborted (core dumped)