最有用或惊人的STL短衬裤 [英] Most useful or amazing STL short liners

问题描述

我正在寻找适合几行的C ++ / STL代码的实用和教育样本。我的实际收藏是：

I'm looking for practical and educational samples of C++ / STL code fitting in few lines. My actual favorites are:

1. 清空向量，释放其保留的内存：

1. Empty a vector freeing its reserved memory:

vector <...>().swap (v)

b $ b

（与暂时交换）

(swap with a temporary)

将地图复制到向量：

map<T1, T2> myMap;
vector< pair<T1, T2> > myVec(myMap.begin(), myMap.end());
// or
myVec.assign(myMap.begin(), myMap.end());

自定义非提升分割：

Custom, non-boost split:

vector<string> &mysplit(const string &s, char delim, vector<string> &elems) {
    stringstream ss(s);
    string item;
    while(getline(ss, item, delim)) { elems.push_back(item); }
    return elems;
}

推荐答案

// std::back_inserter usage ( std::inserter for map )
std::copy( source.begin(), source.end(), std::back_inserter( container ) );

-

// mem_fun and bind usage (but boost better)
std::some_algorithm(..., std::mem_fun( func ) );

不太实用，但功能强大：

not so useful, but powerful:

check is container sorted

check is container sorted

std::adjacent_find( container.begin(), container.end(), greater<Container::value_type>() ) == container.end()

也是你和dirkgently提到的示例。

also examples mentioned by you and dirkgently.

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