Summary

This blog explains how to use C++11 user-defined literals (UDLs) to represent physical units in embedded and firmware code, reducing unit-related bugs and improving code clarity. It shows practical patterns and idioms—constexprs, templates, and strong typedefs—that produce zero-cost, compile-time checked unit types suitable for microcontroller and embedded contexts.

Key Takeaways

• Use user-defined literals to attach units (e.g., m, s, Hz) directly to numeric literals for clearer, self-documenting code.
• Implement zero-cost strong-types with constexpr and templates to get compile-time unit checking without runtime overhead.
• Detect unit mismatches at compile time by leveraging distinct types and operator overloads to prevent common unit-conversion bugs.
• Integrate UDLs with existing embedded code by handling integer vs floating representations and considering fixed-point alternatives.
• Evaluate performance and code-size impact on microcontrollers and choose patterns that balance safety with resource constraints.

Who Should Read This

Embedded firmware engineers and C++ developers working on microcontroller or RTOS projects who want safer, clearer handling of physical units in performance- and resource-constrained systems.

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