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Merge pull request #25 from mborland/from_chars_0

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From chars zero
This commit is contained in:
Matt Borland
2023-04-19 18:06:21 +02:00
committed by GitHub
parent cc32336ad6 08e7b2f06c
commit fa45f44a46
2 changed files with 65 additions and 6 deletions
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21
include/boost/charconv/detail/parser.hpp
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@@ -51,12 +51,7 @@ inline from_chars_result parser(const char* first, const char* last, bool& sign,
++next;
}
// Next we get the significand
constexpr std::size_t significand_buffer_size = limits<Unsigned_Integer>::max_chars10 - 1; // Base 10 or 16
char significand_buffer[significand_buffer_size] {};
std::size_t i = 0;
std::size_t dot_position = 0;
std::size_t extra_zeros = 0;
// If the number is 0 we can abort now
char exp_char;
char capital_exp_char;
if (fmt != chars_format::hex)
@@ -70,6 +65,20 @@ inline from_chars_result parser(const char* first, const char* last, bool& sign,
capital_exp_char = 'P';
}
if (next == last || *next == exp_char || *next == -capital_exp_char)
{
significand = 0;
exponent = 0;
return {next, 0};
}
// Next we get the significand
constexpr std::size_t significand_buffer_size = limits<Unsigned_Integer>::max_chars10 - 1; // Base 10 or 16
char significand_buffer[significand_buffer_size] {};
std::size_t i = 0;
std::size_t dot_position = 0;
std::size_t extra_zeros = 0;
while (*next != '.' && *next != exp_char && *next != capital_exp_char && next != last && i < significand_buffer_size)
{
significand_buffer[i] = *next;

50
test/from_chars_float.cpp
View File

@@ -9,6 +9,7 @@
#include <cstring>
#include <cstdint>
#include <cerrno>
#include <cmath>
#include <utility>
template <typename T>
@@ -144,6 +145,52 @@ void odd_strings_test()
}
template <typename T>
void zero_test()
{
const char* buffer1 = "0e0";
T v1 = 0;
auto r1 = boost::charconv::from_chars(buffer1, buffer1 + std::strlen(buffer1), v1);
BOOST_TEST_EQ(r1.ec, 0);
BOOST_TEST_EQ(v1, static_cast<T>(0));
BOOST_TEST(!std::signbit(v1));
const char* buffer2 = "-0e0";
T v2 = 0;
auto r2 = boost::charconv::from_chars(buffer2, buffer2 + std::strlen(buffer2), v2);
BOOST_TEST_EQ(r2.ec, 0);
BOOST_TEST_EQ(v2, static_cast<T>(-0));
BOOST_TEST(std::signbit(v2));
const char* buffer3 = "0.0";
T v3 = 0;
auto r3 = boost::charconv::from_chars(buffer3, buffer3 + std::strlen(buffer3), v3);
BOOST_TEST_EQ(r3.ec, 0);
BOOST_TEST_EQ(v3, static_cast<T>(0.0));
BOOST_TEST(!std::signbit(v3));
const char* buffer4 = "-0.0";
T v4 = 0;
auto r4 = boost::charconv::from_chars(buffer4, buffer4 + std::strlen(buffer4), v4);
BOOST_TEST_EQ(r4.ec, 0);
BOOST_TEST_EQ(v4, static_cast<T>(-0));
BOOST_TEST(std::signbit(v4));
const char* buffer5 = "0";
T v5 = 0;
auto r5 = boost::charconv::from_chars(buffer5, buffer5 + std::strlen(buffer5), v5);
BOOST_TEST_EQ(r5.ec, 0);
BOOST_TEST_EQ(v5, static_cast<T>(0));
BOOST_TEST(!std::signbit(v5));
const char* buffer6 = "-0";
T v6 = 0;
auto r6 = boost::charconv::from_chars(buffer6, buffer6 + std::strlen(buffer6), v6);
BOOST_TEST_EQ(r6.ec, 0);
BOOST_TEST_EQ(v6, static_cast<T>(-0));
BOOST_TEST(std::signbit(v6));
}
int main()
{
simple_integer_test<float>();
@@ -171,5 +218,8 @@ int main()
simple_hex_scientific_test<long double>();
#endif
zero_test<float>();
zero_test<double>();
return boost::report_errors();
}