mirror of
https://github.com/fmtlib/fmt.git
synced 2024-11-07 08:31:16 +00:00
Add a bigint stub and reenable grisu
This commit is contained in:
parent
b2f0b6e44e
commit
56b5c192a0
@ -466,6 +466,24 @@ FMT_FUNC fp get_cached_power(int min_exponent, int& pow10_exponent) {
|
||||
return fp(data::pow10_significands[index], data::pow10_exponents[index]);
|
||||
}
|
||||
|
||||
class bigint {
|
||||
private:
|
||||
basic_memory_buffer<uint32_t> value_;
|
||||
static FMT_CONSTEXPR_DECL const int radix = 32;
|
||||
|
||||
friend struct formatter<bigint>;
|
||||
|
||||
public:
|
||||
explicit bigint(uint64_t n) {
|
||||
value_.resize(2);
|
||||
value_[0] = n & ~uint32_t(0);
|
||||
value_[1] = static_cast<uint32_t>(n >> 32);
|
||||
}
|
||||
|
||||
bigint(const bigint&) = delete;
|
||||
void operator=(const bigint&) = delete;
|
||||
};
|
||||
|
||||
enum round_direction { unknown, up, down };
|
||||
|
||||
// Given the divisor (normally a power of 10), the remainder = v % divisor for
|
||||
@ -710,7 +728,7 @@ FMT_API bool grisu_format(Double value, buffer<char>& buf, int precision,
|
||||
if (precision != -1) {
|
||||
if (precision > 17) return false;
|
||||
fp_value.normalize();
|
||||
auto cached_pow = get_cached_power(
|
||||
const auto cached_pow = get_cached_power(
|
||||
min_exp - (fp_value.e + fp::significand_size), cached_exp10);
|
||||
fp_value = fp_value * cached_pow;
|
||||
fixed_handler handler{buf.data(), 0, precision, -cached_exp10, fixed};
|
||||
@ -738,14 +756,18 @@ FMT_API bool grisu_format(Double value, buffer<char>& buf, int precision,
|
||||
grisu_shortest_handler<3> handler{buf.data(), 0, (upper - fp_value).f};
|
||||
result = grisu_gen_digits(upper, upper.f - lower.f, exp, handler);
|
||||
size = handler.size;
|
||||
if (result == digits::error) {
|
||||
// TODO: use fallback
|
||||
return false;
|
||||
}
|
||||
} else {
|
||||
++lower.f; // \tilde{M}^- + 1 ulp -> M^-_{\uparrow}.
|
||||
--upper.f; // \tilde{M}^+ - 1 ulp -> M^+_{\downarrow}.
|
||||
grisu_shortest_handler<2> handler{buf.data(), 0, (upper - fp_value).f};
|
||||
result = grisu_gen_digits(upper, upper.f - lower.f, exp, handler);
|
||||
size = handler.size;
|
||||
assert(result != digits::error);
|
||||
}
|
||||
if (result == digits::error) return false;
|
||||
buf.resize(to_unsigned(size));
|
||||
}
|
||||
exp -= cached_exp10;
|
||||
@ -831,6 +853,29 @@ char* sprintf_format(Double value, internal::buffer<char>& buf,
|
||||
}
|
||||
} // namespace internal
|
||||
|
||||
template <> struct formatter<internal::bigint> {
|
||||
format_parse_context::iterator parse(format_parse_context& ctx) {
|
||||
return ctx.begin();
|
||||
}
|
||||
|
||||
format_context::iterator format(const internal::bigint& n,
|
||||
format_context& ctx) {
|
||||
auto out = ctx.out();
|
||||
bool first = true;
|
||||
for (auto i = n.value_.size(); i > 0; --i) {
|
||||
auto value = n.value_[i - 1];
|
||||
if (first) {
|
||||
if (value == 0 && i > 1) continue;
|
||||
out = format_to(out, "{:x}", value);
|
||||
first = false;
|
||||
continue;
|
||||
}
|
||||
out = format_to(out, "{:08x}", value);
|
||||
}
|
||||
return out;
|
||||
}
|
||||
};
|
||||
|
||||
#if FMT_USE_WINDOWS_H
|
||||
|
||||
FMT_FUNC internal::utf8_to_utf16::utf8_to_utf16(string_view s) {
|
||||
|
@ -445,7 +445,7 @@ OutputIt copy_str(InputIt begin, InputIt end, OutputIt it) {
|
||||
}
|
||||
|
||||
#ifndef FMT_USE_GRISU
|
||||
# define FMT_USE_GRISU 0
|
||||
# define FMT_USE_GRISU 1
|
||||
#endif
|
||||
|
||||
template <typename T> constexpr bool use_grisu() {
|
||||
|
@ -22,8 +22,17 @@
|
||||
|
||||
#undef max
|
||||
|
||||
using fmt::internal::bigint;
|
||||
using fmt::internal::fp;
|
||||
|
||||
static_assert(!std::is_copy_constructible<bigint>::value, "");
|
||||
static_assert(!std::is_copy_assignable<bigint>::value, "");
|
||||
|
||||
TEST(BigIntTest, Construct) {
|
||||
EXPECT_EQ("42", fmt::format("{}", bigint(0x42)));
|
||||
EXPECT_EQ("123456789abcedf0", fmt::format("{}", bigint(0x123456789abcedf0)));
|
||||
}
|
||||
|
||||
template <bool is_iec559> void test_construct_from_double() {
|
||||
fmt::print("warning: double is not IEC559, skipping FP tests\n");
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user