我有以下课程：
- template <typename Type = void>
- class AlignedMemory {
- public:
- AlignedMemory(size_t alignment,size_t size)
- : memptr_(0) {
- int iret(posix_memalign((void **)&memptr_,alignment,size));
- if (iret) throw system_error("posix_memalign");
- }
- virtual ~AlignedMemory() {
- free(memptr_);
- }
- operator Type *() const { return memptr_; }
- Type *operator->() const { return memptr_; }
- //operator Type &() { return *memptr_; }
- //Type &operator[](size_t index) const;
- private:
- Type *memptr_;
- };
并尝试实例化一个自动变量,如下所示：
- AlignedMemory blah(512,512);
这会出现以下错误：
src/cpfs/entry.cpp:438: error: missing template arguments before ‘blah’
我究竟做错了什么？ void不是允许的默认参数吗？
解决方法
我想你需要写：
- AlignedMemory<> blah(512,512);
见14.3 [temp.arg] / 4：
When default template-arguments are used,a template-argument list can be empty. In that case the empty
<>brackets shall still be used as the template-argument-list.
