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use named arg with static name in compile-time API

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to get arg index by name at compile-time
This commit is contained in:
Alexey Ochapov
2021-04-18 13:59:24 +03:00
committed by Victor Zverovich
parent ce6e7d8620
commit ca821982ee
4 changed files with 115 additions and 39 deletions
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18
test/compile-test.cc
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@ -210,6 +210,11 @@ TEST(CompileTest, ManualOrdering) {
}
TEST(CompileTest, Named) {
auto runtime_named_field_compiled =
fmt::detail::compile<decltype(fmt::arg("arg", 42))>(FMT_COMPILE("{arg}"));
static_assert(std::is_same_v<decltype(runtime_named_field_compiled),
fmt::detail::runtime_named_field<char>>);
EXPECT_EQ("42", fmt::format(FMT_COMPILE("{}"), fmt::arg("arg", 42)));
EXPECT_EQ("41 43", fmt::format(FMT_COMPILE("{} {}"), fmt::arg("arg", 41),
fmt::arg("arg", 43)));
@ -237,6 +242,19 @@ TEST(CompileTest, Named) {
EXPECT_THROW(fmt::format(FMT_COMPILE("{invalid}"), fmt::arg("valid", 42)),
fmt::format_error);
# if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS
using namespace fmt::literals;
auto statically_named_field_compiled =
fmt::detail::compile<decltype("arg"_a = 42)>(FMT_COMPILE("{arg}"));
static_assert(std::is_same_v<decltype(statically_named_field_compiled),
fmt::detail::field<char, int, 0>>);
EXPECT_EQ("41 43",
fmt::format(FMT_COMPILE("{a0} {a1}"), "a0"_a = 41, "a1"_a = 43));
EXPECT_EQ("41 43",
fmt::format(FMT_COMPILE("{a1} {a0}"), "a0"_a = 43, "a1"_a = 41));
# endif
}
TEST(CompileTest, FormatTo) {