Question

代码语法如下：

System Administrator

有人能解释一下这里做了什么吗？语法static void *gostruct[] = { [0 ... 255] = &&l_bad, ['\t'] = &&l_loop, [' '] = &&l_loop, ['\r'] = &&l_loop, ['\n'] = &&l_loop, ['"'] = &&l_qup, [':'] = &&l_loop, [','] = &&l_loop, ['['] = &&l_up, [']'] = &&l_down, // tracking [] and {} individually would allow fuller validation but is really messy ['{'] = &&l_up, ['}'] = &&l_down, ['-'] = &&l_bare, [48 ... 57] = &&l_bare, // 0-9 [65 ... 90] = &&l_bare, // A-Z [97 ... 122] = &&l_bare // a-z }; ........ ....... l_bad: *vlen = cur - json; // where error'd return 0; ........ ........和 [0 ... 255]在这做什么？

Answer 1

Header 1 Header 2 Header 3 Normalized Status Match type 0 Boston Label 1 "phrase 1" phrase 1 eligible Phrase 1 DC/Baltimore Label 2 [phrase 2] phrase 2 eligible Exact 2 Philly/NJ Label 3 "phrase 3" phrase 3 eligible Phrase 3 Philly/NJ Label 4 "phrase 4" phrase 4 eligible Phrase 4 Philly/NJ Label 5 "phrase 5" phrase 5 eligible Phrase 5 Portland Label 6 "phrase 6" phrase 6 eligible Phrase 6 Raleigh/Charlotte Label 7 [phrase 7] phrase 7 eligible Exact 7 Raleigh/Charlotte Label 8 "phrase 8" phrase 8 eligible Phrase 0 Boston Label 1 +phrase +1 phrase 1 eligible Broad 1 Boston Label 1 [phrase 1] phrase 1 eligible Exact 2 DC/Baltimore Label 2 +phrase +2 phrase 2 eligible Broad 3 DC/Baltimore Label 2 "phrase 2" phrase 2 eligible Phrase 5 Philly/NJ Label 3 +phrase +3 phrase 3 eligible Broad 6 Philly/NJ Label 4 +phrase +4 phrase 4 eligible Broad 7 Philly/NJ Label 5 +phrase +5 phrase 5 eligible Broad 8 Philly/NJ Label 3 [phrase 3] phrase 3 eligible Exact 9 Philly/NJ Label 4 [phrase 4] phrase 4 eligible Exact 10 Philly/NJ Label 5 [phrase 5] phrase 5 eligible Exact 11 Portland Label 6 +phrase +6 phrase 6 eligible Broad 12 Portland Label 6 [phrase 6] phrase 6 eligible Exact 13 Raleigh/Charlotte Label 7 +phrase +7 phrase 7 eligible Broad 14 Raleigh/Charlotte Label 8 +phrase +8 phrase 8 eligible Broad 15 Raleigh/Charlotte Label 7 "phrase 7" phrase 7 eligible Phrase 16 Raleigh/Charlotte Label 8 [phrase 8] phrase 8 eligible Exact是GCC提供的扩展

https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated-Inits

要将一系列元素初始化为相同的值，请写入private int gvDataCount { get { object count = ViewState["gvDataCount"]; if (count == null) count = gvTest.PageSize; return Convert.ToInt32(count); } set { ViewState["gvDataCount"] = value; } } private void BindData() { //.... var list = items.Skip(gvTest.PageIndex * gvTest.PageSize).Take(gvTest.PageSize).ToList(); this.gvDataCount = list.Count; gvTest.DataSource = list; gvTest.VirtualItemCount = items.Count; gvTest.DataBind(); } protected void gvTest_RowCreated(object sender, GridViewRowEventArgs e) { if (e.Row.RowType != DataControlRowType.DataRow) return; if (e.Row.RowIndex > this.gvDataCount) e.Row.Visible = false; }。这是一个GNU扩展。例如，
...

[first ... last] = value是另一个扩展程序

https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels-as-Values

您可以获取当前函数中定义的标签的地址（或包含函数）和一元运算符int widths[] = { [0 ... 9] = 1, [10 ... 99] = 2, [100] = 3 };。价值有输入&&。该值是常量，可以在任何地方使用该类型的常量有效。例如：
&&

这是什么＆＃34; [0 ... 255] =＆＃34; C中的语法？

1 个答案: