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Allow read_unsigned to read 0 digits

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* Will allow reading "optional" integers.
This commit is contained in:
Howard Hinnant 2017-07-24 08:18:18 -04:00
parent 170ebfd354
commit e6b1e0fe58
1 changed files with 3 additions and 2 deletions
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5
date.h
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@ -5297,7 +5297,7 @@ read_signed(std::basic_istream<CharT, Traits>& is, unsigned m = 1, unsigned M =
{
if (c == '-' || c == '+')
(void)is.get();
auto x = static_cast<int>(read_unsigned(is, m, M));
auto x = static_cast<int>(read_unsigned(is, std::max(m, 1u), M));
if (!is.fail())
{
if (c == '-')
@ -5306,7 +5306,8 @@ read_signed(std::basic_istream<CharT, Traits>& is, unsigned m = 1, unsigned M =
}
}
}
is.setstate(std::ios::failbit);
if (m > 0)
is.setstate(std::ios::failbit);
return 0;
}