basic_string.tcc (basic_string(const basic_string&, size_type, size_type), [...]): Avoid unnecessarily constructing iterators.

2004-01-27  Paolo Carlini  <pcarlini@suse.de>

	* include/bits/basic_string.tcc
	(basic_string(const basic_string&, size_type, size_type),
	basic_string(const basic_string&, size_type, size_type,
	const _Alloc&)): Avoid unnecessarily constructing iterators.

From-SVN: r76696