Method MyOptionalString

tests/common/test-custom.cpp:21–21

{
public:
    MyOptionalString() : valid_(false) {}
    MyOptionalString(const std::string& str) : valid_(true), str_(str) {}
    void set(const std::string& str) { valid_ = true; str_ = str; }
    void reset() { valid_ = false; str_.clear(); }