double_buffer.hpp

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#pragma once
 
namespace teditor {
 
template <typename Type>
struct DoubleBuffer {
  DoubleBuffer(): data(), pos(0) {}
  Type& current() { return data[pos]; }
  const Type& current() const { return data[pos]; }
  Type& next() { return data[pos ^ 1]; }
  const Type& next() const { return data[pos ^ 1]; }
  void update() { pos ^= 1; }
 
 private:
  Type data[2];
  int pos;
};  // struct DoubleBuffer
 
}  // namespace teditor