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c++casting

C++ always use checked_cast instead of static_cast?

When I read about C++ casting operators, I see generally see 4 types of casts for example here: Cast types

const_cast
dynamic_cast
reinterpret_cast
static_cast

But what about checked_cast as described here checked_cast

Should we always use checked_cast instead of static_cast as a rule of thumb?

Solution

  • checked_cast only replaces static_cast.

    That article assumes that you never want a lossy conversion. If you have a float and want the largest int not larger than that, checked_cast is incorrect.

    It also assumes that the conversion goes both ways. If it doesn't then it's ill formed.