相关疑难解决方法(0)

虽然最好只抛出从std::exception类派生的类型的异常,但C++可以抛出任何东西.以下所有示例都是有效的C++:

throw "foo";  // throws an instance of const char*
throw 5;      // throws an instance of int

struct {} anon;
throw anon;   // throws an instance of not-named structure

throw []{};   // throws a lambda!

最后一个例子很有趣,因为它可能允许传递一些代码在catch站点执行,而不必定义单独的类或函数.

但是有可能抓住一个lambda(或一个闭包)吗？catch ([]{} e)不起作用.

我是线程的新手，我遇到了让我困惑的情况，我尝试在放入线程的函数中抛出异常，并且在 main() 函数中我有一个 try 和 catch 块，但是我仍然收到这些错误：

1. terminate called after throwing an instance of 'char const*'

2. terminate called recursively

下面是我的代码

mutex m;

void AccumulateRange(uint64_t &sum, uint64_t start, uint64_t end) {
    for (uint64_t i = start;i<end;++i){
        sum+=i;
        if (sum>10) 
            throw "Number Exceed";
    }
}

int main(){

    const uint64_t num_threads = 1000;
    uint64_t nums = 1000*1000*1000;
    vector<uint64_t> v(num_threads);
    vector<thread> threads;
    uint64_t steps = nums/num_threads;

    for (uint64_t i = 0;i<num_threads;++i){
        try{
            threads.push_back(thread(AccumulateRange,ref(v[i]),steps*i,(i+1)*steps));
        }
        catch (const char& exception){
            cout<<exception<<endl;
        }
    }
    for …