c++ lamada and vector initialize

C++ 11 lamada

• [capture-list](params)mutable(optional) exception attribute -> ret {body}
• lamada表达式允许捕获局部变量，而类的成员变量则需要捕获this，as：
  [this](){}
• mutable指令修改外部数据的副本
• lamada函数类型声明可用auto，或者function< ()>

#include <vector>
#include <iostream>
#include <algorithm>
#include <functional>
 
int main()
{
    std::vector<int> c { 1,2,3,4,5,6,7 };
    int x = 5;
    c.erase(std::remove_if(c.begin(), c.end(), [x](int n) { return n < x; } ), c.end());
 
    std::cout << "c: ";
    for (auto i: c) {
        std::cout << i << ' ';
    }
    std::cout << '\n';
 
    // the type of a closure cannot be named, but can be inferred with auto
    auto func1 = [](int i) { return i+4; };
    std::cout << "func1: " << func1(6) << '\n'; 
 
    // like all callable objects, closures can be captured in std::function
    // (this may incur unnecessary overhead)
    std::function<int(int)> func2 = [](int i) { return i+4; };
    std::cout << "func2: " << func2(6) << '\n'; 
}

C++ vector

用数组初始化vector

vector<int> vec (arr, arr + sizeof(arr) / sizeof(arr[0]) );

template<typename TV, typename TA>
void FacialSerializer::fillVectorWithArray(TV& lh, const TA& rh)
{
    auto len = sizeof(rh)/sizeof(rh[0]);
//    std::copy(rh, rh+len, std::back_inserter(lh));
    lh.assign(rh, rh+len);
}