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Q: Why would a C header file include implementation?
Header files are traditionally used to declare functions and separate them from their implementations in C files. However, there are instances where implementation can be included within a header file.
A: Inlining and Optimization
When method implementation is included in a header file, the method is implicitly declared as inline. Inline methods are copied directly into the call site when invoked, allowing for better code optimization.
Benefits of Inlining:
Implementation vs. Header File Inclusion
Including method implementation in headers versus defining it in C files has different implications:
Header File Inclusion:
C File Inclusion:
Factors Influencing Implementation Inclusion:
Whether to include implementation in a header file depends on several factors:
Note:
The const keyword does not influence the decision of whether to include implementation in a header file. It indicates that the method will not alter the object's state at runtime.
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