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Implement nested formatter

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This commit is contained in:
Victor Zverovich
2023-09-18 11:09:28 -07:00
parent f6ca4ea199
commit 0e01e46c11
3 changed files with 43 additions and 9 deletions
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11
test/format-test.cc
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@@ -1779,22 +1779,25 @@ TEST(format_test, group_digits_view) {
EXPECT_EQ(fmt::format("{:8}", fmt::group_digits(1000)), " 1,000");
}
#ifdef __cpp_generic_lambdas
struct point {
double x, y;
};
FMT_BEGIN_NAMESPACE
template <>
struct formatter<point> : nested_formatter<double> {
template <> struct formatter<point> : nested_formatter<double> {
auto format(point p, format_context& ctx) const -> decltype(ctx.out()) {
return format_to(ctx.out(), "({}, {})", nested(p.x), nested(p.y));
return write_padded(ctx, [this, p](auto out) -> decltype(out) {
return format_to(out, "({}, {})", nested(p.x), nested(p.y));
});
}
};
FMT_END_NAMESPACE
TEST(format_test, nested_formatter) {
EXPECT_EQ(fmt::format("{:.2f}", point{1, 2}), "(1.00, 2.00)");
EXPECT_EQ(fmt::format("{:>16.2f}", point{1, 2}), " (1.00, 2.00)");
}
#endif // __cpp_generic_lambdas
enum test_enum { foo, bar };
auto format_as(test_enum e) -> int { return e; }