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std.h: Allow formatting std::unexpected type. (#4675)

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In some cases, people might want to format the std::unexpected type itself,
independent of the value type, this commit makes it possible.

Co-authored-by: Robin Oger <robin.oger.work@gmail.com>
This commit is contained in:
Stéén
2026-02-12 00:06:59 +01:00
committed by GitHub
parent f99d530247
commit b35de87ad9
2 changed files with 29 additions and 1 deletions
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10
test/std-test.cc
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@@ -12,7 +12,7 @@
#include <string>
#include <vector>
#include "fmt/os.h" // fmt::system_category
#include "fmt/os.h" // fmt::system_category
#include "fmt/ranges.h"
#include "gtest-extra.h" // StartsWith
@@ -176,6 +176,14 @@ TEST(std_test, expected) {
(fmt::is_formattable<std::expected<int, unformattable2>>::value));
EXPECT_TRUE((fmt::is_formattable<std::expected<int, int>>::value));
EXPECT_TRUE((fmt::is_formattable<std::expected<void, int>>::value));
EXPECT_EQ(fmt::format("{}", std::unexpected{1}), "unexpected(1)");
EXPECT_EQ(fmt::format("{}", std::unexpected<std::string>{"test"}),
"unexpected(\"test\")");
EXPECT_EQ(fmt::format("{}", std::unexpected<char>{'a'}), "unexpected('a')");
EXPECT_FALSE((fmt::is_formattable<std::unexpected<unformattable2>>::value));
#endif
}