How can I know if a std::string was actually created?

Question

I want to use the std::string(size_type count,CharT ch) with a big value for count. Reading https://en.cppreference.com/w/cpp/string/basic_string/basic_string, I could not find an exception definition for this constructor, in case it fails.

If it is correct, although there is not a noexcept clause in the constructor, how can I be sure that the string was created? Should I check if its size is not 0?

The basic_string template uses the allocator to allocate memory, and by default it's the std::allocator template, whose allocate member function can throw std::bad_alloc on failure. — Some programmer dude
– Some programmer dude, Commented Aug 25, 2019 at 14:53

Timo · Accepted Answer · 2019-08-25 14:56:30Z

Your link says it under Exceptions:

Throws std::length_error if the length of the constructed string would exceed max_size() (for example, if count > max_size() for (2)). Calls to Allocator::allocate may throw.

Also std::string uses an allocator which means std::bad_alloc can be thrown aswell, if the allocator fails to allocate the requested amount of memory.

@canellas Consider accepting this answer to remove your question from the list off unanswered questions.

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