[#bsl-bitset-2constructor-08f]
= xref:bsl.adoc[bsl]::xref:bsl/bitset.adoc[bitset]::bitset
:relfileprefix: ../../
:mrdocs:

Create a bitset from characters in the specified `str`.

== Synopsis

Declared in `<bslstl_bitset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class CHAR_TYPE,
    class TRAITS,
    class ALLOCATOR>
explicit
bitset(
    xref:bsl/basic_string-0faf.adoc[bsl::basic_string<CHAR_TYPE, TRAITS, ALLOCATOR>] const& str,
    bsl::basic_string<CHAR_TYPE, TRAITS, ALLOCATOR>::size_type pos = 0,
    bsl::basic_string<CHAR_TYPE, TRAITS, ALLOCATOR>::size_type n = bsl::basic_string<CHAR_TYPE, TRAITS, ALLOCATOR>::npos,
    CHAR_TYPE zeroChar = CHAR_TYPE('0'),
    CHAR_TYPE oneChar = CHAR_TYPE('1'));
----

== Description

Create a bitset with its first `M` bit positions corresponding to the characters in the specified `pos` of the specified `str`. `M` is the smaller of the parameterized `N` and `str.length()`. If `M < N`, the remaining bit positions are initialized to 0. Characters with the value `zeroChar` correspond to an unset bit and characters with the value `oneChar` correspond to a set bit. The behavior is undefined if the characters in the specified `str` is not the specified `zeroChar` and not the specified `oneChar`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *str*
| character sequence providing bit values
| *pos*
| starting index in `str` (default 0)
| *n*
| maximum number of characters to use (default npos)
| *zeroChar*
| character representing an unset bit (default '0')
| *oneChar*
| character representing a set bit (default '1')
|===


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