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OpenMP中一个变量可以有三种类型，即shared、private和reduction，默认为shared，除非如下三种特别情况：
一、在并行for循环中紧临parallel for 语句的循环变量是私有的；
二、并行区域代码块里的声明的变量是私有的；
三、所有通过private，firstprivate，lastprivate和reduction子句声明的变量为私有变量。
#include #include #include #include #include #include using namespace std;int main(int argc, char *argv[]){ ifstream ifs(argv[1]); string name; map brands; while (!ifs.eof()) { getline(ifs, name); map ::const_iterator it = brands.find(name); if (it == brands.end()) { brands[name] = 1; } else { brands[name] = it->second + 1; } } vector names; map ::const_iterator it; for (it = brands.begin(); it != brands.end(); ++it) { names.push_back(it->first); } vector counts(names.size());#pragma omp parallel{ int i; #pragma omp for for (i = 0; i < names.size(); ++i) { int count = 0; map ::const_iterator it2; for (it2 = brands.begin(); it2 != brands.end(); ++it2) { string name = it2->first; if (name.find(names[i]) != string::npos) { count += it2->second; } } counts[i] = count; }} for (int i = 0; i < names.size(); ++i) { cout << names[i] << "\t" << counts[i] << endl; } return 0;}
转载于:https://www.cnblogs.com/agnostic/p/3795107.html