Question

我一直试图将参数传递给线程函数，但一直无法。我试过阅读它（Passing multiple arguments to a threaded function），但我仍然无法弄明白。这是我的代码：

#include <iostream>
#include <thread>

using namespace std;

void func(int t)
{
    cout << t << endl;
}

int main()
{
    thread t1(func,4);
    t1.join();
    return 0;
}

我在命令行中运行它（我使用重要的zsh incase）：

g++ test.cpp
./a.out

但我收到了这些错误：

thread_test.cpp:14:12: error: no matching constructor for initialization of 'std::__1::thread'
thread t1(func,4);
       ^  ~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:379:9: 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:268:5: 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:275:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
thread() _NOEXCEPT : __t_(0) {}
^
1 error generated.

如果这很重要，我正在使用带有OSX 10.11.4的mac

另外，要查看我正在编译的c ++的哪个版本，我运行了这个命令并将其输出：

g++ --version

配置： - prefix = / Applications / Xcode.app / Contents / Developer / usr --with-gxx-include-dir = / Applications / Xcode.app / Contents / Developer / Platforms / MacOSX.platform / Developer /SDKs/MacOSX10.11.sdk/usr/include/c++/4.2.1 Apple LLVM版本7.3.0（clang-703.0.31）目标：x86_64-apple-darwin15.4.0 线程模型：posix InstalledDir：/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Answer 1

通过-std=c++11，它会起作用;看下面的成绩单。（在OS X上运行。）

nathanst% g++ t.cpp 
t.cpp:13:12: error: no matching constructor for initialization of 'std::__1::thread'
    thread t1(func,4);
           ^  ~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:379:9: 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:268:5: 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:275:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
    thread() _NOEXCEPT : __t_(0) {}
    ^
1 error generated.
nathanst% g++ -std=c++11 t.cpp

多线程c ++将参数传递给函数

1 个答案: