Question

Possible Duplicate:
Inserting and removing commas from integers in c++

I want to write double values with the decimal separator as in the current locale, but I do not want it grouped by the grouping character from the current locale. The current approach with

stringstream s;
s.imbue(std::locale(""));

solves only one of the issues. The current output is like 1,234.567 instead of the wanted 1234.567

How can I change this?

Answer 1

with the help of dirkgently’s post inserting and removing commas from integers, I created the following class:

class no_grouping : public std::numpunct_byname<char> {
    std::string do_grouping() const { return ""; }

public:
    no_grouping() : numpunct_byname("") {}
};

Important here is to derive from numpunkct_byname and initialize it with the constructor parameter “” for the local locale.

Then the stream can easily be imbued with the following code:

ostringstream stringBuff;
std::locale locale(std::locale(""),new no_grouping);
stringBuff.imbue(locale);

this will remove the grouping, but it will take the decimal separator from the local locale.