These using-declarations appear to have been added for simplicity when moving the non-standard extensions from namespace std to namespace __gnu_cxx. Dumping all these names into namespace __gnu_cxx allows unportable uses like __gnu_cxx::size_t and __gnu_cxx::pair, which serve no useful purpose. This patch removes most of the using-declarations from namespace scope, then either qualifies names as needed or adds using-declarations at block scope or typedefs at class scope. * include/backward/hashtable.h (size_t, ptrdiff_t) (forward_iterator_tag, input_iterator_tag, _Construct, _Destroy) (distance, vector, pair, __iterator_category): Remove using-declarations that add these names to namespace __gnu_cxx. * include/ext/bitmap_allocator.h (size_t, ptrdiff_t): Likewise. * include/ext/debug_allocator.h (size_t): Likewise. * include/ext/functional (size_t, unary_function, binary_function) (mem_fun1_t, const_mem_fun1_t, mem_fun1_ref_t, const_mem_fun1_ref_t): Likewise. * include/ext/malloc_allocator.h (size_t, ptrdiff_t): Likewise. * include/ext/memory (ptrdiff_t, pair, __iterator_category): Likewise. * include/ext/mt_allocator.h (size_t, ptrdiff_t): Likewise. * include/ext/new_allocator.h (size_t, ptrdiff_t): Likewise. * include/ext/numeric (iota): Fix outdated comment. * include/ext/pool_allocator.h (size_t, ptrdiff_t): Likewise. * include/ext/rb_tree (_Rb_tree, allocator): Likewise. * include/ext/rope (size_t, ptrdiff_t, allocator, _Destroy): Likewise. * include/ext/ropeimpl.h (size_t, printf, basic_ostream) (__throw_length_error, _Destroy, std::__uninitialized_fill_n_a): Likewise. * include/ext/slist (size_t, ptrdiff_t, _Construct, _Destroy) (allocator, __true_type, __false_type): Likewise. From-SVN: r271807
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