Can someone explain me the macro:
#define tr(c,it) for( typeof(c.begin()) it=c.begin(); it!=c.end(); ++it )
Plz stress on use of typeof and why this macro can be used for all the containers.
# | User | Rating |
---|---|---|
1 | tourist | 3947 |
2 | jiangly | 3734 |
3 | Radewoosh | 3646 |
4 | jqdai0815 | 3620 |
4 | Benq | 3620 |
6 | orzdevinwang | 3612 |
7 | ecnerwala | 3581 |
8 | Geothermal | 3569 |
8 | cnnfls_csy | 3569 |
10 | ksun48 | 3479 |
# | User | Contrib. |
---|---|---|
1 | awoo | 162 |
2 | maomao90 | 160 |
3 | nor | 156 |
4 | cry | 155 |
4 | adamant | 155 |
4 | atcoder_official | 155 |
4 | -is-this-fft- | 155 |
8 | maroonrk | 153 |
9 | SecondThread | 147 |
10 | Petr | 146 |
Can someone explain me the macro:
#define tr(c,it) for( typeof(c.begin()) it=c.begin(); it!=c.end(); ++it )
Plz stress on use of typeof and why this macro can be used for all the containers.
Name |
---|
typeof
is a non-standard extension. C++11 analog is decltype; but in C++11 this macro is most likely unnecessary because you can just writefor (auto& elem : c)
.