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Add optional support (#3303)

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tom-huntington
2023-02-26 03:45:56 +13:00
committed by GitHub
parent 3a69529e8b
commit 5b8302079d
4 changed files with 84 additions and 0 deletions
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28
test/std-test.cc
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@ -50,6 +50,34 @@ TEST(std_test, thread_id) {
EXPECT_FALSE(fmt::format("{}", std::this_thread::get_id()).empty());
}
TEST(std_test, optional) {
#ifdef __cpp_lib_optional
EXPECT_EQ(fmt::format("{}", std::optional<int>{}), "none");
EXPECT_EQ(fmt::format("{}", std::pair{1, "second"}), "(1, \"second\")");
EXPECT_EQ(fmt::format("{}", std::vector{std::optional{1}, std::optional{2},
std::optional{3}}),
"[optional(1), optional(2), optional(3)]");
EXPECT_EQ(
fmt::format("{}", std::optional<std::optional<const char*>>{{"nested"}}),
"optional(optional(\"nested\"))");
EXPECT_EQ(
fmt::format("{:<{}}", std::optional{std::string{"left aligned"}}, 30),
"optional(\"left aligned\" )");
EXPECT_EQ(
fmt::format("{::d}", std::optional{std::vector{'h', 'e', 'l', 'l', 'o'}}),
"optional([104, 101, 108, 108, 111])");
EXPECT_EQ(fmt::format("{}", std::optional{std::string{"string"}}),
"optional(\"string\")");
EXPECT_EQ(fmt::format("{}", std::optional{'C'}), "optional(\'C\')");
EXPECT_EQ(fmt::format("{:.{}f}", std::optional{3.14}, 1), "optional(3.1)");
struct unformattable {};
EXPECT_FALSE((fmt::is_formattable<unformattable>::value));
EXPECT_FALSE((fmt::is_formattable<std::optional<unformattable>>::value));
EXPECT_TRUE((fmt::is_formattable<std::optional<int>>::value));
#endif
}
TEST(std_test, variant) {
#ifdef __cpp_lib_variant
EXPECT_EQ(fmt::format("{}", std::monostate{}), "monostate");