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char hello[] = "hello world"; std::string str; str.resize(sizeof(hello)-1); memcpy(&str[0], hello, sizeof(hello)-1); This code is undefined behaviour in C++98. Is it legal in C++11?
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The practice in British English is to use write to when there is no direct object, so we would say I wrote to your uncle, rather than I wrote your uncle. However, when a direct object is present and it occurs after the name of the person addressed, to is omitted, so we would say I wrote your uncle a letter.
The letter is a formal business letter, so it must be "I am writing to you". "Writing you" is colloquial and informal.
It can be seen as a little old-fashioned, but more accurate would be to say it is formal to use "I am writing to". However, it is still common for business letters. It definitely gives a sense that the author and recipient do not have a close relationship.
One writes a letter to someone. Having been written, the letter is a letter for that person. So the mail carrier would be at the door with a letter to Jason only if s/he had written said letter. To take another example: The person who used to live in my apartment has moved to a different apartment down the hall.
Yes, the code is legal in C++11 because the storage for std::string is guaranteed to be contiguous and your code avoids overwriting the terminating NULL character (or value initialized CharT).
From N3337, §21.4.5 [string.access]
const_reference operator[](size_type pos) const; reference operator[](size_type pos);1 Requires:
pos <= size().
2 Returns:*(begin() + pos)ifpos < size(). Otherwise, returns a reference to an object of typecharTwith valuecharT(), where modifying the object leads to undefined behavior.
Your example satisfies the requirements stated above, so the behavior is well defined.
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