boost/multiprecision
2
0
Fork 0
mirror of https://github.com/boostorg/multiprecision.git synced 2026-02-19 14:32:35 +00:00
Code Issues Projects Releases Wiki Activity

Fix some buglets in decimal rounding.

Browse Source 
[SVN r85420]
This commit is contained in:
John Maddock
2013-08-22 12:38:19 +00:00
parent 3ae83df777
commit 47ed6aca2e
1 changed files with 8 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/boost/multiprecision/detail/float_string_cvt.hpp
View File

@@ -16,7 +16,7 @@
namespace boost{ namespace multiprecision{ namespace detail{
inline void round_string_up_at(std::string& s, int pos)
inline void round_string_up_at(std::string& s, int pos, int& expon)
{
//
// Rounds up a string representation of a number at pos:
@@ -24,14 +24,18 @@ inline void round_string_up_at(std::string& s, int pos)
if(pos < 0)
{
s.insert(0, 1, '1');
s.erase(s.size() - 1);
++expon;
}
else if(s[pos] == '9')
{
s[pos] = '0';
round_string_up_at(s, pos - 1);
round_string_up_at(s, pos - 1, expon);
}
else
{
if((pos == 0) && (s[pos] == '0') && (s.size() == 1))
++expon;
++s[pos];
}
}
@@ -152,12 +156,12 @@ std::string convert_to_string(Backend b, std::streamsize digits, std::ios_base::
// Bankers rounding:
if((*result.rbegin() - '0') & 1)
{
round_string_up_at(result, result.size() - 1);
round_string_up_at(result, result.size() - 1, expon);
}
}
else if(cdigit >= 5)
{
round_string_up_at(result, result.size() - 1);
round_string_up_at(result, result.size() - 1, expon);
}
}
}