Return true if ch is in the character set.
Synopsis
constexpr
bool
operator()(char ch) const noexcept;
Description
This function returns true if the character ch
is in the set, otherwise it returns false.
Complexity
Constant.
Exception Safety
Throws nothing.
Return Value
true
if ch
is in the set.
Parameters
Name |
Description |
ch |
The character to test. |
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