string::find_first_not

`string::find_first_not_of`

Find the first character missing from the specified string.

Synopsis

std::size_t
find_first_not_of(
    string_view sv,
    std::size_t pos = 0) const noexcept; (1)

std::size_t
find_first_not_of(
    char ch,
    std::size_t pos = 0) const noexcept; (2)

Description

Search from pos onward for the first character in this string that is not equal to any of the characters in the string provided as the first argument.

(1) compares with the characters in sv.
(2) compares with the character ch.

Complexity

(1) linear in size() + sv.size().
(2) linear in size().

Exception Safety

No-throw guarantee.

Return Value

The index of the found character, or npos if none exists.

Parameters

Name Description

Name	Description
`sv`	The characters to compare with.
`pos`	The index to start searching at.
`ch`	The character to compare with.

sv

The characters to compare with.

pos

The index to start searching at.

ch

The character to compare with.

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