I have some difficulties regarding codes that were working correctly on previous CLANG compilers and are working with no issue on other GNU, older CLANG, ... C++ compilers
e.g.,
#include <iostream>
#include <sstream>
#include <string>
#define SNUM(x) static_cast<std::ostringstream &>(std::ostringstream() << std::dec << x).str()
int main() {
				int n = 100;
				std::string s = "matrix (of size N=" + SNUM(n) + ")";
				std::cout << s << std::endl;
}
it is working as supposed with,
>> g++ test.cpp
>> ./a.out
matrix (of size N=100)
But it fails with c++11,
>> g\+\+ -std=c++11 test.cpp
test.cpp:7:41: error: non-const lvalue reference to type 'basic_ostringstream<...>' cannot bind to a temporary of type 'basic_ostringstream<...>'
				std::string s = "matrix (of size N=" + SNUM(n) + ")";
																							 ^~~~~~~
test.cpp:4:17: note: expanded from macro 'SNUM'
#define SNUM(x) static_cast<std::ostringstream &>(std::ostringstream() << std::dec << x).str()
								^																 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
The compiler is,
>>g\+\+ --version
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 12.0.0 (clang-1200.0.32.28)
Target: x86_64-apple-darwin20.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
yafa
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