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Fix FP formatting to a non-back_insert_iterator with sign & numeric alignment (#756)

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This commit is contained in:
Victor Zverovich 2018-06-07 18:41:40 +02:00
parent 6322b47e60
commit fc6e0fe992
2 changed files with 8 additions and 1 deletions
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3
include/fmt/format.h
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@ -2927,7 +2927,8 @@ void basic_writer<Range>::write_double(T value, const format_specs &spec) {
align_spec as = spec;
if (spec.align() == ALIGN_NUMERIC) {
if (sign) {
*reserve(1) = sign;
auto &&it = reserve(1);
*it++ = sign;
sign = 0;
if (as.width_)
--as.width_;

6
test/format-test.cc
View File

@ -232,6 +232,12 @@ TEST(FormatToTest, Format) {
EXPECT_EQ("part1part2", s);
}
TEST(FormatToTest, FormatToNonbackInsertIteratorWithSignAndNumericAlignment) {
char buffer[16] = {};
fmt::format_to(buffer, "{: =+}", 42.0);
EXPECT_STREQ("+42", buffer);
}
TEST(FormatterTest, Escape) {
EXPECT_EQ("{", format("{{"));
EXPECT_EQ("before {", format("before {{"));