Most useful or amazing STL short liners

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余生分开走 2021-01-29 22:55

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

Empty a vector freeing its reserved memory:<

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时光说笑 (楼主)

2021-01-29 23:06

copy(istreambuf_iterator(cin), istreambuf_iterator(),
     ostream_iterator(cout));

Another oft used idiom is initializing a container from an array:

#include 
using namespace std;

int main() {
    typedef std::map LUT;
    typedef LUT::value_type LUT_item_t;

    const LUT_item_t items[] = { LUT_item_t('b',1), 
                                 LUT_item_t('a',5) 
                               };

    LUT my_map(items, items + sizeof items/sizeof items[0]);
    return 0;
}

But if you want pure magic, look into Boost Lambda Library ;) A sample:

vector vp(10); 
sort(vp.begin(), vp.end(), *_1 > *_2);

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