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Use dragonbox to print floats (#481)

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* add new float printer

* more includes

* compare as floats
This commit is contained in:
water111
2021-05-13 21:05:05 -04:00
committed by GitHub
parent 790e65a78c
commit 60c670df3a
6 changed files with 3486 additions and 42 deletions
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test/test_common_util.cpp
+37
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@@ -1,5 +1,6 @@
#include <string>
#include <vector>
#include <limits>
#include "common/util/FileUtil.h"
#include "common/util/Trie.h"
@@ -9,6 +10,7 @@
#include "common/util/json_util.h"
#include "common/util/Range.h"
#include "third-party/fmt/core.h"
#include "common/util/print_float.h"
TEST(CommonUtil, get_file_path) {
std::vector<std::string> test = {"cabbage", "banana", "apple"};
@@ -94,4 +96,39 @@ TEST(CommonUtil, BitRange) {
EXPECT_EQ(get_bit_range(UINT64_MAX), Range<int>(0, 64));
EXPECT_EQ(get_bit_range(UINT64_MAX - 1), Range<int>(1, 64));
EXPECT_EQ(get_bit_range(UINT64_MAX / 2), Range<int>(0, 63));
}
TEST(CommonUtil, FloatToString) {
float test_floats[] = {0.f,
1.f,
-1.f,
0.1f,
-0.1f,
1234,
12340,
123400,
-1234000,
0.00342f,
-0.003423f,
std::numeric_limits<float>::min(),
std::numeric_limits<float>::max(),
std::numeric_limits<float>::lowest(),
std::numeric_limits<float>::epsilon(),
std::numeric_limits<float>::denorm_min(),
-std::numeric_limits<float>::min(),
-std::numeric_limits<float>::max(),
-std::numeric_limits<float>::lowest(),
-std::numeric_limits<float>::epsilon(),
-std::numeric_limits<float>::denorm_min()};
for (auto x : test_floats) {
EXPECT_TRUE(x == (float)std::stod(float_to_string(x)));
}
// all three of these constants should become _exactly_ 1460961.25 when converted to a float.
// to break a tie, dragonbox defaults to round to even, which is nice because that's the
// default rounding mode.
EXPECT_EQ("1460961.2", float_to_string(1460961.25));
EXPECT_EQ("1460961.2", float_to_string(1460961.20));
EXPECT_EQ("1460961.2", float_to_string(1460961.30));
}