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#include <iostream> #define DUMPSTR_WNAME(os, name, a) \ do { (os) << (name) << " is value " << (a) << std::endl; } while(false) #define DUMPSTR(os, a) DUMPSTR_WNAME((os), #a, (a)) #define DUMP(a) DUMPSTR_WNAME(std::cout, #a, (a)) struct S { int a1; float a2; std::string a3; std::ostream& dump(std::ostream& os) { DUMPSTR(os, a1); DUMPSTR(os, a2); DUMPSTR(os, a3); return os; } }; int main() { S s = { 3, 3.14, " 03.1415926" }; s.dump(std::cout); DUMP(s.a1); DUMP(s.a2); DUMP(s.a3); return 0; }
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