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代价较高的 std::shared_ptr<std::iostream>
#12
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你可以继承 streambuf, 定义自己的buffer类(例如MyCharBuffer),实现相关的接口,对pkbyContent进行封装。 |
为了简化,继承std::stringbuf 作为例子。 |
class MyCharBuffer : public std::stringbuf MyOssBuffer.h:12:3: 错误:‘_Mysb’未声明 |
#ifdef _WIN32
使用这种方式 win linux下可以编译通过 |
提供的有关上传数据的接口参数为
std::shared_ptr<std::iostream>
,如果遇上传的数据来源于程序产生,那么使用如下方式解决:示例中,存在损耗性能的方面:
构建
std::string const kstrContent
将裸数据构建
std::string
动态分配内存空间。构建
std::stringstream
对象从
std::string
构建std::stringstream
将导致std::string_buf
通过std::allocator
再次动态分配内存。智能指针的引用管理
对于一个大的文件循环上传分片,由
std::shared_ptr
不断的引用管理,存在一定的计算。可见,一块内存数据被反复折腾,而不是以较少代价的方式被处理。
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