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# Data Recorder
`record/recorder.hpp` provides an efficient recorder for mixed data types. The template argument takes all the supported types. The recorder stores the data as a variant of deques of those types. `std::deque` is used to avoid the cost of reallocating when a `std::vector` would grow, and typically a recorder is used in cases when the length is unknown.
```c++
glz::recorder<double, float> rec;
double x = 0.0;
float y = 0.f;
rec["x"] = x;
rec["y"] = y;
for (int i = 0; i < 100; ++i) {
x += 1.5;
y += static_cast<float>(i);
rec.update(); // saves the current state of x and y
}
glz::write_file_json(rec, "recorder_out.json", std::string{});
```
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