Question 185402 in Visual Studio Code Question posted in
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Visual Studio Code – Output all line graphemes to the console

How to do this in C++ using boost locale?
In one of the questions I found an example
Cross-platform iteration of Unicode string (counting Graphemes using ICU)

#include <iostream>
#include <string_view>

#include <boost/locale.hpp>

using namespace std::string_view_literals;

int main()
{
    boost::locale::generator gen;
    auto string = "noël 😸😾"sv;
    boost::locale::boundary::csegment_index map{
        boost::locale::boundary::character, std::begin(string),
        std::end(string), gen("")};
    for (const auto& i : map)
    {
        std::cout << i << 'n';
    }
}

This code turned out to be non-working.How can I fix it?
Error:

E0289 no instance of constructor "boost::locale::boundary::segment_index::segment_index [with BaseIterator=const char *]" matches the argument list

C2440 ‘initializing’: cannot convert from ‘initializer list’ to ‘boost::locale::boundary::segment_index<const char *>’

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Version of boost: 1.81.0, I use a pre-release version of the C++23 and C17 standard. Visual Studio. The boost is statically bonded. Icu is installed. File encoded utf8. I compile the project as release x64

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2

Answers


  1. 0

    It does work for me with gen("") as well as gen("en_US.utf8"):

    enter image description here

    If it doesn’t work for you, check that

    • Your source file encoding (UTF8 is assumed here)
    • Boost is built with ICU support
    • your system supports UNICODE locales
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  2. 0

    Problem is most probably handling encoding.

    If you are using MSVC make sure, that:

    • source file is encoded with UTF-8
    • compler received /utf-8 switch – to properly read source code and generate executable which for strings uses UTF-8
    • locale is configured properly:
    #include <iostream>
#include <locale>
#include <string_view>

#include <boost/locale.hpp>

using namespace std::string_view_literals;

int main()
{
    std::locale::global(std::locale(".utf-8")); // inform standard library that executable is using UTF-8 encoding
    std::cout.imbue(std::locale("")); // use system locale on standard output

    boost::locale::generator gen;
    auto string = "noël 😸😾"sv;
    boost::locale::boundary::csegment_index map{
        boost::locale::boundary::character, std::begin(string),
        std::end(string), gen(".utf-8")};
    for (const auto& i : map)
    {
        std::cout << i << 'n';
    }
}
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