File filetostring.h

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#ifndef TEMPLAT_UTIL_FILETOSTRING_H
#define TEMPLAT_UTIL_FILETOSTRING_H

/* This file is part of TempLat, available at https://cosmolattice.github.io/templat .
   Copyright 2021-2026 The TempLat authors, see AUTHORS.md.
   Released under the MIT license, see LICENSE.md. */

// File info: Main contributor(s): Wessel Valkenburg, Year: 2019

#include <fstream>

namespace TempLat
{

  class FileToString
  {
  public:
    // Put public methods here. These should change very little over time.
    FileToString(const std::string fName) : mFName(fName), didIt(false) {}

    operator std::string()
    {
      readFile();
      return payload;
    }

    friend std::ostream &operator<<(std::ostream &ostream, FileToString &obj)
    {
      ostream << (std::string)obj;
      return ostream;
    }

  private:
    /* Put all member variables and private methods here. These may change arbitrarily. */
    const std::string mFName;

    std::string payload;

    bool didIt;

    void readFile()
    {
      if (didIt) return;
      didIt = true;
      std::ifstream t(mFName);
      t.seekg(0, std::ios::end);
      size_t size = t.tellg();
      std::string buffer(size, ' ');
      t.seekg(0);
      t.read(&buffer[0], size);
      payload = buffer;
    }
  };

} // namespace TempLat

#endif