https://llvm.org/bugs/show_bug.cgi?id=31535
Bug ID: 31535
Summary: std::sort and std::unique can not use std::function
with -std=c++14
Product: libc++
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: d...@gmx.net
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
The following two minimal examples both compile with
clang++ -std=c++11 main.cpp
but do not with
clang++ -std=c++14 main.cpp
// example 1
#include <algorithm>
#include <functional>
#include <vector>
int main()
{
std::vector<int> xs = {0,1,2};
std::function<bool(int x, int y)> cmp = [](int x, int y)
{ return x < y; };
std::sort(std::begin(xs), std::end(xs), cmp);
}
// example 2
#include <algorithm>
#include <functional>
#include <vector>
int main()
{
std::vector<int> xs = {0,1,2};
std::function<bool(int x, int y)> p = [](int x, int y)
{ return x == y; };
std::unique(std::begin(xs), std::end(xs), p);
}
The error message looks like this:
In file included from
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/algorithm:61:
In file included from
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/stl_algobase.h:71:
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/predefined_ops.h:123:31:
error: indirection requires pointer operand ('int' invalid)
{ return bool(_M_comp(*__it1, *__it2)); }
The used version is the default one from the package manager in Ubuntu 16.04:
clang++ --version
clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
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