Return the decimal value of a hex character

Synopsis

Declared in <boost/url/grammar/hexdig_chars.hpp>

signed char
hexdig_value(char ch) noexcept;

Description

This function returns the decimal value of a hexadecimal character, or ‐1 if the argument is not a valid hexadecimal digit.

BNF

HEXDIG      = DIGIT
            / "A" / "B" / "C" / "D" / "E" / "F"
            / "a" / "b" / "c" / "d" / "e" / "f"

Return Value

The decimal value or ‐1

Parameters

Name

Description

ch

The character to check

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