[string.erase]

constexpr basic_string& erase(size_type pos = 0, size_type n = npos);

Effects: Determines the effective length xlen of the string to be removed as the smaller of n and size() - pos.

Removes the characters in the range [begin() + pos, begin() + pos + xlen).

Throws: out_of_range if pos > size().

constexpr iterator erase(const_iterator p);

Returns: An iterator which points to the element immediately following p prior to the element being erased.

If no such element exists, end() is returned.

Throws: Nothing.

constexpr iterator erase(const_iterator first, const_iterator last);

Preconditions: first and last are valid iterators on *this.

[first, last) is a valid range.

Effects: Removes the characters in the range [first, last).

Returns: An iterator which points to the element pointed to by last prior to the other elements being erased.

If no such element exists, end() is returned.

Throws: Nothing.

constexpr void pop_back();

Throws: Nothing.

27 Strings library [strings]