为什么我应该避免在c ++中使用malloc?
可能重复:
new / delete和malloc / free有什么区别?
我在哪些情况下使用malloc vs new?
为什么我应该避免在c ++中使用malloc
?
因为malloc
不调用新分配的对象的构造函数。
考虑:
class Foo
{
public:
Foo() { /* some non-trivial construction process */ }
void Bar() { /* does something on Foo's instance variables */ }
};
// Creates an array big enough to hold 42 Foo instances, then calls the
// constructor on each.
Foo* foo = new Foo[42];
foo[0].Bar(); // This will work.
// Creates an array big enough to hold 42 Foo instances, but does not call
// the constructor for each instance.
Foo* foo = (Foo*)malloc(42 * sizeof(Foo));
foo[0].Bar(); // This will not work!
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