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// === old.h // #pragma once // Old header struct MyOldType { int x, y; }; // === safe.h // #pragma once #feature on safety // Safe C++ header that uses MyOldType // #include "old.h" // Safe for all inputs. inline MyOldType make_old_type_safe(int x, int y) safe { return { x, y }; } // This is implicit when leaving header files. Only including // because I'm glueing multiple headers together. #feature off safety // === old.cxx // Legacy .cxx file that uses old.h and safe.h // #include "old.h" // not needed since included by safe.h // #include "safe.h" #include <cstdio> int main() { // Call the safe function. MyOldType obj = make_old_type_safe(10, 20); // Print it. // 10 20 printf("%d %d\n", obj.x, obj.y); // Print the make_old_type_safe function type to show that it's 'safe'. // MyOldType(*)(int, int) safe puts(decltype(&make_old_type_safe)~string); // safe is not a reserved word! int safe = 101; }
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