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Add format_to_n overload that accepts FMT_COMPILE (from #1767) (#1869)

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* Add format_to_n overload that accepts FMT_COMPILE

* add FormatToNWithCompileMacro test into CompileTest

Co-authored-by: Dmitriy Kurkin <Dmitriy.Kurkin@itiviti.com>
This commit is contained in:
Alexey Ochapov 2020-09-15 17:28:06 +03:00 committed by GitHub
parent 5b5a597198
commit f674434a67
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2 changed files with 18 additions and 0 deletions
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10
include/fmt/compile.h
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@ -674,6 +674,16 @@ format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n,
return {it.base(), it.count()};
}
template <typename OutputIt, typename S, typename... Args,
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n, const S&,
const Args&... args) {
constexpr auto compiled = detail::compile<Args...>(S());
auto it = format_to(detail::truncating_iterator<OutputIt>(out, n), compiled,
args...);
return {it.base(), it.count()};
}
template <typename CompiledFormat, typename... Args>
size_t formatted_size(const CompiledFormat& cf, const Args&... args) {
return format_to(detail::counting_iterator(), cf, args...).count();

8
test/compile-test.cc
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@ -165,6 +165,14 @@ TEST(CompileTest, FormatTo) {
EXPECT_STREQ("42", buf);
}
TEST(CompileTest, FormatToNWithCompileMacro) {
constexpr auto buffer_size = 8;
char buffer[buffer_size];
auto res = fmt::format_to_n(buffer, buffer_size, FMT_COMPILE("{}"), 42);
*res.out = '\0';
EXPECT_STREQ("42", buffer);
}
TEST(CompileTest, TextAndArg) {
EXPECT_EQ(">>>42<<<", fmt::format(FMT_COMPILE(">>>{}<<<"), 42));
EXPECT_EQ("42!", fmt::format(FMT_COMPILE("{}!"), 42));