[llvm-bugs] [Bug 28057] New: implicit instantiation of undefined template basic_streambuf when using istreambuf_iterator
via llvm-bugs
llvm-bugs at lists.llvm.org
Wed Jun 8 14:44:49 PDT 2016
https://llvm.org/bugs/show_bug.cgi?id=28057
Bug ID: 28057
Summary: implicit instantiation of undefined template
basic_streambuf when using istreambuf_iterator
Product: libc++
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangbugs at nondot.org
Reporter: jasonliu.development at gmail.com
CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
Classification: Unclassified
I tried to compile the following code with libc++ but failed:
#include <iterator>
#include <string>
int main(int argc, char *argv[])
{
std::istreambuf_iterator<char, std::char_traits<char> > myit;
bool b = myit != myit;
return 0;
}
I got the following error message:
error: implicit instantiation of undefined template
'std::__1::basic_streambuf<char, std::__1::char_traits<char> >'
if (__sbuf_ &&
traits_type::eq_int_type(__sbuf_->sgetc(),traits_type::eof()))
^
I think the problem happens because we are trying to call the member function
"sgetc()" in class streambuf. But we only have the forward declaration of class
streambuf.
Notice that when I try to include streambuf header at the beginning of iterator
header, I will get circular reference error(streambuf header includes other
headers that will include iterator header again).
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