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A fast and efficient QR/Micro QR/rMQR Code implementation in Crystal lang

  • crystal
  • qrcode
  • qrcode-encoder
  • qrcode-generator

This shard provides facilities for checking whether a constant exists at compile time, and for a variety of different conditional compilation options. Code can be conditionally compiled based on the existence of a constant, version number constraints, or whether an environment variable is set truthy or not.

  • crystal