Default Extractable

Note

This concept is provided for exposition only. It does not appear in the requirements for any library template.

Description

A type models Default Extractable if there are types Ch and Tr such that its instances can be read from instances of std::basic_istream<Ch, Tr> using operator>>.

Refinement of

Associated Types

Character type	A standard library character type
Traits type	A standard library character traits type `Tr` with `Tr::char_type` equal to the character type

Note: A type T may model the concept Default Extractable for several different character and traits types.

Notation

`E`	-	A type which is a model of Default Extractable
`Ch`	-	The character type of `E`
`Tr`	-	The character traits type of `Tr`
`e`	-	Mutable object of type `E`
`in`	-	Mutable object of type `std::basic_istream<Ch, Tr>`

Valid Expressions / Semantics

Expression	Expression Type	Semantics
`in >> e`	`std::basic_istream<Ch, Tr>&`	Modifies `e` to correspond to a character sequence read from `in`, subject to `in`'s `locale`, format flags, etc.

Models

Intergral and floating point types.
Specializations of std::basic_string.
Specializations of std::complex.
etc.

Revised 20 May, 2004

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

Sha'arei Tefila, an Orthodox Shul (Synagogue) in Salt Lake City, Utah Chabad Lubavitch of Utah