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#include <iostream> #include <string> bool stdstring_supports_cow() { std::string s1 = "0123456789"; std::string s2 = s1; std::string s3 = s2; bool result1 = s1.c_str() == s2.c_str(); bool result2 = s1.c_str() == s3.c_str(); s2[0] = 'X'; bool result3 = s1.c_str() != s2.c_str(); bool result4 = s1.c_str() == s3.c_str(); s3[0] = 'X'; bool result5 = s1.c_str() != s3.c_str(); return result1 && result2 && result3 && result4 && result5; } int main() { if (stdstring_supports_cow()) std::cout << "std::string is COW." << std::endl; else std::cout << "std::string is NOT COW." << std::endl; return 0; }
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