1
當下列代碼由g ++或clang ++編譯時,我得到警告「返回對臨時對象的引用」(g ++)和「返回對本地臨時對象的引用」(clang ++)。返回引用臨時,常量差異
有人能告訴我爲什麼getData_warning
展示這些警告,而getData_nowarning
不?
struct Geom {
int * data;
};
// Not ideal because one can change the pointed to value
int * const & getData_nowarning (Geom const & geom) {
return geom.data;
}
// Ideal because one cannot change the pointed to value.
int const * const & getData_warning (Geom const & geom) {
return geom.data; // <------------------- WARNING HERE
}
void test() {
Geom const geom = { new int(0) };
int * data1 = getData_nowarning(geom);
int const * data2 = getData_warning(geom);
}