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others.rst 更新章节「5.18. sizeof」

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Isaac Ge 2015-07-22 16:18:46 +08:00
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google-cpp-styleguide/others.rst
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@ -524,7 +524,7 @@
.. tip:: .. tip::
尽可能用 ``sizeof(varname)`` 代替 ``sizeof(type)``. 尽可能用 ``sizeof(varname)`` 代替 ``sizeof(type)``.
使用 ``sizeof(varname)`` 是因为当代码中变量类型改变时会自动更新. 某些情况下 ``sizeof(type)`` 或许有意义, 但还是要尽量避免, 因为它会导致变量类型改变后不能同步. 使用 ``sizeof(varname)`` 是因为当代码中变量类型改变时会自动更新. 您或许会用 ``sizeof(type)`` 处理不涉及任何变量的代码，比如处理来自外部或内部的数据格式，这时用变量就不合适了。
.. code-block:: c++ .. code-block:: c++
@ -536,6 +536,13 @@
memset(&data, 0, sizeof(Struct)); memset(&data, 0, sizeof(Struct));
.. code-block:: c++
if (raw_size < sizeof(int)) {
LOG(ERROR) << "compressed record not big enough for count: " << raw_size;
return false;
}
5.19. auto 5.19. auto
~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~