C++ Initialization Gotcha: The Subtleties of `=default`
2025-05-15
This article delves into the perplexing world of C++ initialization. A simple example reveals the significant impact of the placement of `=default` on the initialization of struct members: struct members with `=default` in the declaration are zero-initialized (value 0), while those with `=default` in the definition have indeterminate values, leading to undefined behavior if read. The article thoroughly explains the differences between default, value, and zero initialization, and emphasizes the importance of explicitly initializing variables to avoid potential bugs and security risks.
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Initialization