# std::basic_ispanstream<CharT,Traits>::basic_ispanstream

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< cpp‎ | io‎ | basic ispanstream

explicit basic_ispanstream( std::span<CharT> s, std::ios_base::openmode mode = std::ios_base::in ); | (1) | (since C++23)
template< class ROS > explicit basic_ispanstream( ROS&& r ); | (2) | (since C++23)
basic_ispanstream( basic_ispanstream&& rhs ); | (3) | (since C++23)
basic_ispanstream( const basic_ispanstream& ) = delete; | (4) | (since C++23)

Constructs a new `basic_ispanstream`.

1) Uses the storage referenced by `s` as initial underlying buffer of the wrapped std::basic_spanbuf device. The wrapped std::basic_spanbuf object is constructed as basic_spanbuf<Char, Traits>(s, mode | std::ios_base::in).
2) Uses the storage referenced by `r` after converted to std::span<const CharT> as initial underlying buffer of the wrapped std::basic_spanbuf device. The wrapped std::basic_spanbuf object is opened in mode std::ios_base::in. This overload participates in overload resolution only if `ROS` models `borrowed_range`, std::convertible_to<ROS, std::span<CharT>> is false, and std::convertible_to<ROS, std::span<const CharT>> is true.
3) Move constructor. Move constructs the std::basic_istream base subobject and the wrapped std::basic_spanbuf from those of `rhs`, and then calls set_rdbuf with the address of the wrapped std::basic_spanbuf in *this to install it.
4) Copy constructor is deleted. `basic_ispanstream` is not copyable.

### Parameters

s | - | std::span referencing the storage to be use as initial underlying buffer of stream
r | - | `borrowed_range` to be use as initial underlying buffer of stream
mode | - | specifies stream open mode. Following constants and bit-wise OR between them may be used:
Constant | Explanation
`app` | seek to the end of stream before each write
`binary` | open in binary mode
`in` | open for reading
`out` | open for writing
`trunc` | discard the contents of the stream when opening
`ate` | seek to the end of stream immediately after open
`noreplace` (C++23) | open in exclusive mode
other | - | another `basic_ispanstream` to be moved from

### Exceptions

May throw implementation-defined exceptions.

### Example

| This section is incomplete Reason: no example

### See also

(constructor) (C++23) | constructs a `basic_spanbuf` object (public member function of `std::basic_spanbuf<CharT,Traits>`)

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