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Simplify range formatter

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This commit is contained in:
Victor Zverovich 2024-03-09 08:20:27 -08:00
parent 11f2f30f0b
commit e281749c5d
2 changed files with 12 additions and 10 deletions
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10
include/fmt/base.h
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@ -2961,8 +2961,8 @@ template <typename OutputIt, typename Sentinel = OutputIt>
struct format_to_result {
/** Iterator pointing to just after the last successful write in the range. */
OutputIt out;
/** Sentinel indicating the end of the output range. */
Sentinel out_last;
/** Specifies if the output was truncated. */
bool truncated;
FMT_CONSTEXPR operator OutputIt&() & noexcept { return out; }
FMT_CONSTEXPR operator const OutputIt&() const& noexcept { return out; }
@ -2974,13 +2974,15 @@ struct format_to_result {
template <size_t N>
auto vformat_to(char (&out)[N], string_view fmt, format_args args)
-> format_to_result<char*> {
return {vformat_to_n(out, N, fmt, args).out, out + N};
auto result = vformat_to_n(out, N, fmt, args);
return {result.out, result.size > N};
}
template <size_t N, typename... T>
FMT_INLINE auto format_to(char (&out)[N], format_string<T...> fmt, T&&... args)
-> format_to_result<char*> {
return vformat_to(out, fmt, fmt::make_format_args(args...));
auto result = fmt::format_to_n(out, N, fmt, static_cast<T&&>(args)...);
return {result.out, result.size > N};
}
/** Returns the number of chars in the output of ``format(fmt, args...)``. */

12
test/base-test.cc
View File

@ -697,13 +697,13 @@ TEST(core_test, format_to_c_array) {
char buffer[4];
auto result = fmt::format_to(buffer, "{}", 12345);
EXPECT_EQ(4, std::distance(&buffer[0], result.out));
EXPECT_EQ(0, std::distance(result.out, result.out_last));
EXPECT_TRUE(result.truncated);
EXPECT_EQ(buffer + 4, result.out);
EXPECT_EQ("1234", fmt::string_view(buffer, 4));
result = fmt::format_to(buffer, "{:s}", "foobar");
EXPECT_EQ(4, std::distance(&buffer[0], result.out));
EXPECT_EQ(0, std::distance(result.out, result.out_last));
EXPECT_TRUE(result.truncated);
EXPECT_EQ(buffer + 4, result.out);
EXPECT_EQ("foob", fmt::string_view(buffer, 4));
@ -713,24 +713,24 @@ TEST(core_test, format_to_c_array) {
buffer[3] = 'x';
result = fmt::format_to(buffer, "{}", 'A');
EXPECT_EQ(1, std::distance(&buffer[0], result.out));
EXPECT_EQ(3, std::distance(result.out, result.out_last));
EXPECT_FALSE(result.truncated);
EXPECT_EQ(buffer + 1, result.out);
EXPECT_EQ("Axxx", fmt::string_view(buffer, 4));
result = fmt::format_to(buffer, "{}{} ", 'B', 'C');
EXPECT_EQ(3, std::distance(&buffer[0], result.out));
EXPECT_EQ(1, std::distance(result.out, result.out_last));
EXPECT_FALSE(result.truncated);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("BC x", fmt::string_view(buffer, 4));
result = fmt::format_to(buffer, "{}", "ABCDE");
EXPECT_EQ(4, std::distance(&buffer[0], result.out));
EXPECT_EQ(0, std::distance(result.out, result.out_last));
EXPECT_TRUE(result.truncated);
EXPECT_EQ("ABCD", fmt::string_view(buffer, 4));
result = fmt::format_to(buffer, "{}", std::string(1000, '*'));
EXPECT_EQ(4, std::distance(&buffer[0], result.out));
EXPECT_EQ(0, std::distance(result.out, result.out_last));
EXPECT_TRUE(result.truncated);
EXPECT_EQ("****", fmt::string_view(buffer, 4));
}