近日，适马为旗下fp系列的SIGMA fp/SIGMA fp L两款相机，推送了新的固件更新，在增加并优化部分功能的同时，对配套软件SIGMA Photo Pro也进行了优化。
When we define our interfaces in C# 4.0, we are allowed to mark each of the generic parameters as in or out. If we try to set a generic parameter as out and that\'d lead to a problem, the compiler rai
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