‘hash_map’ was not declared in this scope的解决方法
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‘hash_map’ was not declared in this scope的解决方法
由于hash_map定义在__gnu_cxx命名空间中,故你必须在使用时限定名字空间__gnu_cxx::hash_map,或者使用using关键字加一个 using namespace __gnu_cxx; 如下所示:
#include <hash_map>
using namespace stdext;
要使用hash_set时,由于hash_set被包含在include/ext目录下,所以该头文件导入形式如下:
#include <ext/hash_map>
using namespace __gnu_cxx;
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