[C++] update for hinnant16 map

 

[C++] noexcept constructor

Reference:

https://devblogs.microsoft.com/oldnewthing/20220408-00/?p=106438

Using noexcept as operator and making constructor as noexcept.

e.g.

template<typename T>
struct Holder
{
    T value;

template<typename... Args>
    Holder(Args&&... args)
        noexcept(noexcept(T(std::forward<Args>(args)...))) :
        value(std::forward<Args>(args)...) {}
};