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nginx_sgistl_pool

提取nginx内存池部分源码用C++11重写
提取SGI STL部分源码编写的空间配置器

注意在64位Linux下,指针类型占8字节,在宏函数ngx_align_ptr中会把指针类型p强转为数据类型,应该根据特定平台指针宽度调整强转的数据类型大小
指针p调整到align整数倍的地址,在64位linux下,p是指针类型,占8字节,若ngx_uint_t为int,只占4字节,强转时会发生数据截断,再访问地址会发生Segmentation fault

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