Can't pass parameters to std::thread?

Question

I'm trying to use std::thread. My thread is supposed to call a method and pass a struct as a parameter, as so many examples show. Except my very simple code won't compile. For the record, I'm aware of this question but nothing there seems to help me.

Where I call the thread:

void Exporter::save() const {
    thread(write_to_disk, this->parameter).detach();
}

The signature of write_to_disk:

void write_to_disk(const Parameter& parameter)

write_to_disk is defined in a nameless namespace in the .cpp file.

I get the following error:

src/Exporter.cpp:65:5: error: no matching constructor for initialization of 'std::__1::thread'
    thread(write_to_disk, this->parameter).detach();
    ^      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:374:9: note: candidate constructor template not viable: requires single argument '__f', but 2 arguments were provided
thread::thread(_Fp __f)
        ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:263:5: note: candidate constructor not viable: requires 1 argument, but 2 were provided
    thread(const thread&);
    ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:270:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
    thread() _NOEXCEPT : __t_(0) {}
^

Here's an MCVE that fits the description in the question and compiles and runs just fine. Can you provide an MCVE that doesn't? — Casey
– Casey, Commented Dec 22, 2014 at 16:56
This is the closest I can come to my code, but it runs perfectly. I also tried passing a simple int to write_to_disk and it fails with the same error. I wonder if it's a platform issue... — ruipacheco
– ruipacheco, Commented Dec 22, 2014 at 17:03
Also, not sure I trust this online compiler. There was a syntax error and it worked fine. — ruipacheco
– ruipacheco, Commented Dec 22, 2014 at 17:04
Which version of Xcode/clang are you using? A simple test on this end of something quite similar works fine for me. — sfjac
– sfjac, Commented Dec 22, 2014 at 17:05
Latest Xcode: $ clang --version Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn) Target: x86_64-apple-darwin14.0.0 Thread model: posix — ruipacheco
– ruipacheco, Commented Dec 22, 2014 at 17:07

sfjac · Accepted Answer · 2014-12-22 17:23:52Z

6

Works fine for me if I do

clang++ -std=c++11 test.cpp

answered Dec 22, 2014 at 17:23

sfjac

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1 Comment

ruipacheco Over a year ago

clang++ -std=c++11 fixed it. I suspect CMake is messing up my ninja files.

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