Given `std::basic_streambuf<CharT>::int_type __c`, `std::basic_string<CharT> str_`,
and having checked `__c != std::basic_streambuf<CharT>::traits_type::eof()` (substituting typedefs
for clarity), the line `str_.push_back(__c);` is safe according to humans, but truncates according
to compilers. `str_.push_back(static_cast<CharT>(__c));` avoids that problem.
Fixes D27538.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@289105 91177308-0d34-0410-b5e6-96231b3b80d8
Replace "int n = str_.size();" with "int n = static_cast<int>(str_.size());".
int is the correct type to use, because we're eventually calling
"base::pbump(n+1);" where base is std::basic_streambuf.
N4606 27.6.3.3.3 [streambuf.put.area]/4 declares: "void pbump(int n);"
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@288751 91177308-0d34-0410-b5e6-96231b3b80d8
