`A15-4-2`: Ignore elided calls when calculating the exception graph
@lcartey 已经在做这个了。
开始于 2024年1月14日。
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描述
Affected rules
A15-4-2
Description
Copy elision allows the compiler to omit copy and move construction in certain circumstances. Some of these circumstances are considered "mandatory" - i.e. the compiler must omit the explicit construction - and in those circumstances copy and move constructors may never be called.
If you have move/copy constructors which are never expected to be called because they are always elided, you may decide to throw an exception from the copy/move constructor to enforce that it is only used in circumstances where the elision occurs. As our call graph does not currently reflect the mandatory elision of functions, this can cause false positives.
Example
// `foo` is only used in circumstances where it is elided, so this exception is never thrown in practice
constexpr foo(const foo&) : dummy() {
throw some_bad_exception();
};
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