c++ - 使用 std::chrono 计算耗时时出现“段错误”

Question

我改变了this code并编写了这个函数:

#include <ctime>
#include <iomanip>
#include <iostream>
#include <chrono>

#define TIMER(name) Timer timer__(name);
class Timer
{
public:

    Timer(const std::string& name) :
            name_(name), start_(std::chrono::system_clock::now())
    {
    }

    ~Timer()
    {
        auto duration = std::chrono::system_clock::now() - start_;
        std::cout << std::setw(90) << std::left << name_ << ": " <<  std::chrono::duration_cast<std::chrono::seconds>(duration).count() << "s" << std::endl;
    }
private:
    std::string name_ = 0;
    std::chrono::time_point<std::chrono::system_clock> start_ ;
};

问题是有时我会遇到段错误。

用法:

在 main() 中放入这样的东西:

TIMER("Total time");

我用 gcc 5.2.1 编译程序。

Answer 1

有两点说明:
1. 如@Mankarse 所述，从 std::string name_ = 0;
中删除 = 0;2. 来自here :

Each identifier that contains a double underscore __ or begins with an underscore followed by an uppercase letter is reserved to the implementation for any use.

因此，将 Timer timer__(name) 更改为 Timer my_timer(name)