问题
In this example code:
explicit MyClass(std::wstring text) noexcept;
Is the use of noexcept here correct? wstring can potentially throw on construction but does the throw happen before we are in the constructor or while we are in the constructor?
EDIT: Suppose this can be generalised to any function taking a by-value parameter.
回答1:
The construction and destruction of function parameters happens in the context of the caller. So no, if the construction of text throws, that is not a violation of noexcept.
Soon folks would comment and ask for a spec quote :) So I will give you 5.2.2p4
The initialization and destruction of each parameter occurs within the context of the calling function.
来源：https://stackoverflow.com/questions/7628333/constructor-with-by-value-parameter-noexcept