When Should You Use C 's `noexcept` Keyword for Optimal Performance?

When is It Optimal to Utilize "noexcept"?

The "noexcept" keyword in C indicates functions that are guaranteed not to throw exceptions, allowing compilers to optimize code more aggressively. While this knowledge might seem clear-cut, certain practical questions need exploration.

Should "noexcept" Be Applied in All Cases?

While it's tempting to annotate every function that never throws, it's more judicious to consider specific situations. "noexcept" should be used when the compiler cannot independently determine that an exception will never occur, thus enabling optimal optimizations. However, if the compiler can infer this fact, using "noexcept" is redundant and unnecessary.

When to Expect Performance Benefits

The impact of "noexcept" on performance is most noticeable when applied to constructors, assignment operators, and other operations that are frequently invoked by the compiler. By eliminating the need to check for exceptions during these operations, "noexcept" can significantly reduce overhead and improve code efficiency. Modern compilers take advantage of this feature, allowing for substantial performance gains in scenarios where rapid exception handling is crucial.

However, it's important to note that "noexcept" may not always result in measurable improvements. Performance enhancements depend on individual code contexts and the capabilities of the specific compiler used.

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