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#include <string>
using namespace std;
static class Trans
{
public:
	static wstring AddDoubleQuotes(wstring value) { return L"\"" + value + L"\""; }
	static wstring AddDoubleQuotes(double value) { return to_wstring(value); }
 
	template <class T>
	static wstring Trans::GetSubwstring(wstring key, T value)
	{
		if (key != L"")
			return AddDoubleQuotes(key) + L":" + AddDoubleQuotes(value);
		else return AddDoubleQuotes(value);
	};
 
	Trans() { GetSubwstring(L"", 0); }
};
 
int main(void)
{
	Trans::GetSubwstring(L"",0);
	getchar();
	return 0;
}

prog.cpp:10:17: error: extra qualification ‘Trans::’ on member ‘GetSubwstring’ [-fpermissive]
  static wstring Trans::GetSubwstring(wstring key, T value)
                 ^~~~~
prog.cpp:3:1: error: a storage class can only be specified for objects and functions
 static class Trans
 ^~~~~~

Standard output is empty