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Calling std::to_string or std::to_wstring based on given typedef


Calling std::to_string or std::to_wstring based on given typedef

By : Riguey
Date : November 22 2020, 03:01 PM
wish of those help In a library I am internally using typedefs of the following form:
code :
template<class Char>
struct string_traits;
template<>
struct string_traits<char>{
  using string=std::string;
  template<class T>
  static string convert_to_string(T&& t){
    using std::to_string;
    return to_string(std::forward<T>(t));
  }
};
template<>
struct string_traits<wchar_t>{
  using string=std::wstring;
  template<class T>
  static string convert_to_string(T&& t){
    using std::to_wstring;
    return to_wstring(std::forward<T>(t));
  }
};
template <typename TChar = Char, typename T>
std::basic_string<TChar>
ToString(const T& Arg) {
  return string_traits<TChar>::convert_to_string(Arg);
}


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Using std::to_wstring with libstdc++?

Using std::to_wstring with libstdc++?


By : Chris Jones
Date : March 29 2020, 07:55 AM
I wish did fix the issue. std::to_wstring() was added in C++11. The link in your answer, on ideone, is not using the C++11 compiler:
What's the difference between std::to_string, boost::to_string, and boost::lexical_cast<std::string>?

What's the difference between std::to_string, boost::to_string, and boost::lexical_cast<std::string>?


By : user3418880
Date : March 29 2020, 07:55 AM
it should still fix some issue std::to_string, available since C++11, works on fundamental numeric types specifically. It also has a std::to_wstring variant.
It is designed to produce the same results that sprintf would.
code :
template< typename OutType, typename InType >
OutType lexical_cast( const InType & input ) 
{
    // Insert parameter to an iostream
    std::stringstream temp_stream;
    temp_stream << input;

    // Extract output type from the same iostream
    OutType output;
    temp_stream >> output;
    return output;
}
Issue calling to_string with float_format on Pandas DataFrame

Issue calling to_string with float_format on Pandas DataFrame


By : gül boyacioglan
Date : March 29 2020, 07:55 AM
help you fix your problem It's working in your first time because none of your types are float. You could check that with df.dtypes:
code :
In [37]: df.dtypes
Out[37]: 
a     int64
b     int64
m    object
dtype: object
df.describe().to_string(float_format=lambda x: '%.1f' % x)
df.describe().to_string(float_format=lambda x: "{:.1f}".format(x))
_GLIBCXX_USE_C99 is not defined, to_wstring not available

_GLIBCXX_USE_C99 is not defined, to_wstring not available


By : Michael Pujol
Date : March 29 2020, 07:55 AM
I hope this helps you . This is known problem of Google's Android NDK - C++ Standard Library is broken there, unless you're using just small subset of C++ functionality. Macro _GLIBCXX_USE_C99 is defined (or not defined) in $NDK/sources/cxx-stl/gnu-libstdc++/4.9/libs/$ABI/include/bits/c++config.h at the moment when GNU libstdc++ is building (i.e. on Google's side, when they build NDK). Unfortunately, it's built on top of very limited libc (Google's Bionic), so GNU libstdc++ configuration scripts detect it and disable some parts (in particular, std::to_wstring), depending on that absent functionality in libc.
This is one of the main reason why I've started CrystaX NDK - alternative native development kit for Android. In CrystaX NDK, we pay special attention to completeness of libc, libstdc++, and conformance to standards in general. CrystaX NDK works as a drop-in replacement for Google's Android NDK, so most likely it will just work with Visual Studio too.
Implement `to_xstring()` to unite `to_string()` and `to_wstring()`

Implement `to_xstring()` to unite `to_string()` and `to_wstring()`


By : Kaveh Nematipour
Date : March 29 2020, 07:55 AM
seems to work fine You could use SFINAE for this, no? E.g., using std::enable_if:
code :
template <typename CharT, typename T>                                                                                                                                                                    
typename std::enable_if<std::is_same<CharT, char>::value, std::string>::type 
    to_xstring(const T &t)
{
    return std::to_string(t);
}


template <typename CharT, typename T>
typename std::enable_if<!std::is_same<CharT, char>::value, std::wstring>::type 
    to_xstring(const T &t)
{
    return std::to_wstring(t);
}
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