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Ignore zero-padding for non-finite floating points #2310

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merged 5 commits into from
May 27, 2021
Merged

Ignore zero-padding for non-finite floating points #2310

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5951dc2
Ignore zero-padding for non-finite floating points
Liedtke May 23, 2021
49b77ed
keep width for non-finite formatting with 0-padding
Liedtke May 25, 2021
cc7c6af
clang-format
Liedtke May 25, 2021
96e08b0
preserve alignment
Liedtke May 27, 2021
b92319d
align code-style
Liedtke May 27, 2021
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9 changes: 7 additions & 2 deletions include/fmt/format.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1591,10 +1591,15 @@ OutputIt write_nonfinite(OutputIt out, bool isinf,
constexpr size_t str_size = 3;
auto sign = fspecs.sign;
auto size = str_size + (sign ? 1 : 0);
return write_padded(out, specs, size, [=](reserve_iterator<OutputIt> it) {
auto copy_it = [=](reserve_iterator<OutputIt> it) {
if (sign) *it++ = static_cast<Char>(data::signs[sign]);
return copy_str<Char>(str, str + str_size, it);
});
};
// no '0'-padding applied for non-finite values
const bool is_zero_fill =
specs.fill.size() == 1 && *specs.fill.data() == static_cast<Char>('0');
return is_zero_fill ? base_iterator(out, copy_it(reserve(out, size)))
: write_padded<align::right>(out, specs, size, copy_it);
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I suggest copying specs and changing fill from 0 to (space) instead.

}

// A decimal floating-point number significand * pow(10, exp).
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8 changes: 6 additions & 2 deletions test/format-test.cc
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Expand Up @@ -1272,9 +1272,11 @@ TEST(format_test, format_nan) {
double nan = std::numeric_limits<double>::quiet_NaN();
EXPECT_EQ("nan", fmt::format("{}", nan));
EXPECT_EQ("+nan", fmt::format("{:+}", nan));
if (std::signbit(-nan))
EXPECT_EQ("+nan", fmt::format("{:+06}", nan));
if (std::signbit(-nan)) {
EXPECT_EQ("-nan", fmt::format("{}", -nan));
else
EXPECT_EQ("-nan", fmt::format("{:+06}", -nan));
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This should be " -nan" i.e. the width should still apply. Same elsewhere.

} else
fmt::print("Warning: compiler doesn't handle negative NaN correctly");
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nit: please wrap the else statement in {} for consistency with if:

} else {
  fmt::print("Warning: compiler doesn't handle negative NaN correctly");
}

EXPECT_EQ(" nan", fmt::format("{: }", nan));
EXPECT_EQ("NAN", fmt::format("{:F}", nan));
Expand All @@ -1288,6 +1290,8 @@ TEST(format_test, format_infinity) {
EXPECT_EQ("inf", fmt::format("{}", inf));
EXPECT_EQ("+inf", fmt::format("{:+}", inf));
EXPECT_EQ("-inf", fmt::format("{}", -inf));
EXPECT_EQ("+inf", fmt::format("{:+06}", inf));
EXPECT_EQ("-inf", fmt::format("{:+06}", -inf));
EXPECT_EQ(" inf", fmt::format("{: }", inf));
EXPECT_EQ("INF", fmt::format("{:F}", inf));
EXPECT_EQ("inf ", fmt::format("{:<7}", inf));
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