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Enable constexpr support for fmt::format (fmtlib#3403) (#4456)

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This commit is contained in:
Mikhail Svetkin
2025-06-07 16:16:49 +02:00
committed by GitHub
parent 46be88bc1e
commit 5860688d7e
3 changed files with 83 additions and 8 deletions
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46
test/compile-test.cc
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@ -421,3 +421,49 @@ TEST(compile_time_formatting_test, multibyte_fill) {
EXPECT_EQ("жж42", test_format<8>(FMT_COMPILE("{:ж>4}"), 42));
}
#endif
#if FMT_USE_CONSTEXPR_STRING
TEST(compile_test, constexpr_format) {
{
constexpr auto result = []() {
return fmt::format(FMT_COMPILE("{}"), 1) == "1";
}();
EXPECT_TRUE(result);
}
{
constexpr auto result = []() {
return fmt::format(FMT_COMPILE("{:#b}"), 42) == "0b101010";
}();
EXPECT_TRUE(result);
}
{
constexpr auto result = []() {
return "**-42" == fmt::format(FMT_COMPILE("{:*>5}"), -42);
}();
EXPECT_TRUE(result);
}
{
constexpr auto result = []() {
return "10 " == fmt::format(FMT_COMPILE("{: ^3}"), 10);
}();
EXPECT_TRUE(result);
}
{
constexpr auto result = []() {
return "42 is 42" == fmt::format(FMT_COMPILE("{} is {}"), 42, 42);
}();
EXPECT_TRUE(result);
}
constexpr auto result = []() {
return "This is a very huge int: 1234567890" == fmt::format(FMT_COMPILE("This is a very huge int: {}"), 1234567890);
}();
EXPECT_TRUE(result);
}
#endif // FMT_USE_CONSTEXPR_STRING