Developer (#164)

- State before merging the new cluster vector API

---------

Co-authored-by: Patrick <patrick.sieberer@psi.ch>
Co-authored-by: JulianHeymes <julian.heymes@psi.ch>
Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>
Co-authored-by: Xiangyu Xie <45243914+xiangyuxie@users.noreply.github.com>
Co-authored-by: xiangyu.xie <xiangyu.xie@psi.ch>
Co-authored-by: siebsi <sieb.patr@gmail.com>

src/FilePtr.cpp

@@ -0,0 +1,44 @@
+
+#include "aare/FilePtr.hpp"
+#include <fmt/format.h>
+#include <stdexcept>
+#include <utility>
+
+namespace aare {
+
+FilePtr::FilePtr(const std::filesystem::path& fname, const std::string& mode = "rb") {
+    fp_ = fopen(fname.c_str(), mode.c_str());
+    if (!fp_)
+        throw std::runtime_error(fmt::format("Could not open: {}", fname.c_str()));
+}
+
+FilePtr::FilePtr(FilePtr &&other) { std::swap(fp_, other.fp_); }
+
+FilePtr &FilePtr::operator=(FilePtr &&other) {
+    std::swap(fp_, other.fp_);
+    return *this;
+}
+
+FILE *FilePtr::get() { return fp_; }
+
+int64_t FilePtr::tell() {
+    auto pos = ftell(fp_);
+    if (pos == -1)
+        throw std::runtime_error(fmt::format("Error getting file position: {}", error_msg()));
+    return pos;
+} 
+FilePtr::~FilePtr() {
+    if (fp_)
+        fclose(fp_); // check?
+}
+
+std::string FilePtr::error_msg(){
+    if (feof(fp_)) {
+        return "End of file reached";
+    }
+    if (ferror(fp_)) {
+        return fmt::format("Error reading file: {}", std::strerror(errno));
+    }
+    return "";
+}
+} // namespace aare