I have a relatively simple use case: I want to associate a trait to a class which will return some user defined string, namely some user-defined registration ID. As this registrations are supposed to be defined at compile-time I would like it to be constexpr so I wrote something like the following:
template <typename T>
struct ClassRegistration
{
static constexpr std::string_view
Name();
};
template <>
struct ClassRegistration<int>
{
static constexpr std::string_view
Name()
{
return std::string_view{ "int" };
}
};
Everything is working fine but as string_view doesn't actually own its buffer I wonder if it's guaranteed to be safe, that I'm not just referring to a dangling pointer. From what I read string literals are guaranteed to have the lifetime as long as that of the program itself (from this SO Lifetime of a string literal returned by a function ).
Therefore, is this usage of string_view safe and appropriate?
string literals are guaranteed to have the lifetime as long as that of the program itself
That's correct.
Therefore, is this usage of
string_view
safe and appropriate?
Yes, your code is fine.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.