27 Input/output library [input.output]

In addition to the requirements ([fs.req]), function template parameters named Source shall be one of:

• (1.1)

  basic_string<EcharT, traits, Allocator>. A function argument const Source& source shall have an effective range [source.begin(), source.end()).

• (1.2)

  basic_string_view<EcharT, traits>. A function argument const Source& source shall have an effective range [source.begin(), source.end()).

• (1.3)

  A type meeting the input iterator requirements that iterates over a NTCTS. The value type shall be an encoded character type. A function argument const Source& source shall have an effective range [source, end) where end is the first iterator value with an element value equal to iterator_traits<Source>::value_type().

• (1.4)

  A character array that after array-to-pointer decay results in a pointer to the start of a NTCTS. The value type shall be an encoded character type. A function argument const Source& source shall have an effective range [source, end) where end is the first iterator value with an element value equal to iterator_traits<decay_t<Source>>::value_type().

Functions taking template parameters named Source shall not participate in overload resolution unless either Source is a specialization of basic_string or basic_string_view or the qualified-id iterator_traits<decay_t<Source>>::value_type is valid and denotes a possibly const encoded character type ([temp.deduct]).

[ Note: See path conversions ([path.cvt]) for how the value types above and their encodings convert to path::value_type and its encoding.  — end note ]

Arguments of type Source shall not be null pointers.