Question

当我运行此示例代码时：

void func(int x)
{
    std::cout<<x<< " I'm a free func!\n";
}

class Obj 
{
    public: 
    void member(int x) { std::cout<<x<< " I'm a member func!\n";}
};

int main()
{
    // Define the signature
    using func_ref_t = function_ref<void(int)>;

    // Can be used with stateful lambdas
    int bar = 1;
    auto lambda = [&bar](int x){std::cout<<x<< " I'm a lambda!\n"; ++bar;};

    // Copy and move
    func_ref_t lref(lambda);
    auto cpy = lref;
    auto mv = std::move(lref);
    cpy(1);
    mv(2);

    // See the modified var from the lambda
    std::cout<<bar<<'\n';

    // Use with free functions
    auto fref = func_ref_t{func};
    fref(4);

    // We can wrap member functions with stateful lamdas
    Obj obj;
    auto mem = [&obj](int x) { obj.member(x); };

    auto mref = func_ref_t{mem};
    mref(5);

}

在终端上输入以下内容：from flask import Flask app = Flask(__name__) def main () : return "Welcome to Flask " if __name__ == "__main__": app.run(debug=True, host="0.0.0.0", port=80)，输出为：

python3 app.py

它不会停止

当我在浏览器中打开127.0.0.1时，它会显示* Serving Flask app "app" (lazy loading) * Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead. * Debug mode: on * Running on http://0.0.0.0:80/ (Press CTRL+C to quit) * Restarting with stat * Debugger is active! * Debugger PIN: 144-032-769 127.0.0.1 - - [13/Jun/2018 00:11:59] "GET / HTTP/1.1" 404 - 127.0.0.1 - - [13/Jun/2018 00:11:59] "GET /favicon.ico HTTP/1.1" 404 - 127.0.0.1 - - [13/Jun/2018 00:12:15] "GET / HTTP/1.1" 404 - 127.0.0.1 - - [13/Jun/2018 00:12:16] "GET /favicon.ico HTTP/1.1" 404 - 127.0.0.1 - - [13/Jun/2018 00:12:22] "GET / HTTP/1.1" 404 - 127.0.0.1 - - [13/Jun/2018 00:12:22] "GET /favicon.ico HTTP/1.1" 404 -

Answer 1

你没有给main()路线装饰者。你的功能应该是这样的：

@app.route('/')
def main():
    return "Welcome to Flask "

无法托管带有烧瓶的Web服务器

1 个答案: