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MT4-to-MT5 Compatibility Wrappers for Indicator and EA Code

Article MQL5 code base
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Summary

The document describes a compatibility library intended to help port MetaTrader 4 indicators and Expert Advisors to MetaTrader 5. It explains that developers can include the library as a separate header or incorporate it into a project, then replace selected MT4 calls with shared wrapper functions so one codebase can target both platforms.

Its examples cover retrieving ask and bid prices, symbol properties such as digits, tick size, tick value, lot limits, point size and spread, and bar open, high, low and close values. The table illustrates the proposed replacements, but the document provides no code implementation, tests, conversion results or details about unsupported functions. It therefore serves as a brief integration overview; developers would need to inspect and validate the library for their specific platform versions and trading logic.

Key ideas

  • The library aims to ease conversion of MT4 indicators and Expert Advisors to MT5.
  • Developers can include it as a separate header or integrate it into a project.
  • Wrapper functions provide cross-platform access to quotes and symbol properties.
  • Bar price access is also mapped to timeframe-aware MT5 functions.
  • The document lists example mappings but gives no implementation or validation evidence.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.