mp_units::utility::at_most_one

Finds the single modifier from modifiers present in [begin, end).]

Synopsis

Declared in <mp‐units/utility/format.h>

template<std::forward_iterator It>
[[nodiscard]]
constexpr
It
at_most_one_of(
    It begin,
    It end,
    std::string_view modifiers);

Throws when more than one is used, which is how a format‐spec states that a group of modifier letters is mutually exclusive.

the position of the single modifier present, or end when there is none

Note	The return value should not be discarded.

Name

Description

begin

the beginning of the range to search

end

the end of the range to search

modifiers

the set of mutually exclusive modifier characters to look for

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