. 242 47 融會貫通 - 練習 243 48 練習題的參考答案 244 XI 裸機開發：上午 245 49 歡迎瞭解 Rust 裸機開發 246 50 no_std 247 50.1 最簡單的 no_std 程式 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 50.2 alloc . . . 標準程式庫包含各式實用巨集。 • println!(format, ..) prints a line to standard output, applying formatting described in std::fmt. • format!(format, ..) 的運作方式與 println! 類似，但會以字串形式傳回結果。 • dbg!(expression) 會記錄並傳回運算式的值。 • todo 等於size_of::>(). 如果想示範位元表示法實際運作時「可能」的樣子，可以使用下列範例程式碼。請務必注意，編譯器並 無對這個表示法提供保證，因此這完全不安全。 use std::mem::transmute; macro_rules! dbg_bits { ($e:expr, $bit_type:ty) => { println!("- {}: {:#x}", stringify

. . . . . . . . . . . . . . . . . . . . . . . 436 34.20 Optimize network I/O during parallel execution . . . . . . . . . . . . . . . . . . . . 437CONTENTS vii 34.21 Fix deprecation warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1393 84.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1393 84.4 Reference . . . . . . changes in account. Alternatively, the precision or the rounding can be changed only within the execution of a particular block of code by using the same functions with a do block: julia> setrounding(BigFloat

. . . . . . . . . . . . . . . . . . . . . . . 436 34.20 Optimize network I/O during parallel execution . . . . . . . . . . . . . . . . . . . . 437CONTENTS vii 34.21 Fix deprecation warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1393 84.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1393 84.4 Reference . . . . . . changes in account. Alternatively, the precision or the rounding can be changed only within the execution of a particular block of code by using the same functions with a do block: julia> setrounding(BigFloat

. . . . . . . . . . . . . . . . . . . . . . . 466 35.22 Optimize network I/O during parallel execution . . . . . . . . . . . . . . . . . . . . 467 35.23 Fix deprecation warnings . . . . . . . . . . Alternative linear algebra backends . . . . . . . . . . . . . . . . . . . . . . . . . . 476 35.31 Execution latency, package loading and package precompiling time . . . . . . . . . 476 36 Workflow Tips 479 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1629 86.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1629 86.4 Reference . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . 466 35.22 Optimize network I/O during parallel execution . . . . . . . . . . . . . . . . . . . . 467 35.23 Fix deprecation warnings . . . . . . . . . . Alternative linear algebra backends . . . . . . . . . . . . . . . . . . . . . . . . . . 476 35.31 Execution latency, package loading and package precompiling time . . . . . . . . . 476 36 Workflow Tips 479 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1629 86.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1629 86.4 Reference . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . 466 35.22 Optimize network I/O during parallel execution . . . . . . . . . . . . . . . . . . . . 467 35.23 Fix deprecation warnings . . . . . . . . . . Alternative linear algebra backends . . . . . . . . . . . . . . . . . . . . . . . . . . 476 35.31 Execution latency, package loading and package precompiling time . . . . . . . . . 476 36 Workflow Tips 479 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1629 86.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1629 86.4 Reference . . . . . .

4 Memory management and arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . 474 35.5 Execution latency, package loading and package precompiling time . . . . . . . . . 481 35.6 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1693 88.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1693 88.4 Reference . . . . . . changes in account. Alternatively, the precision or the rounding can be changed only within the execution of a particular block of code by using the same functions with a do block:CHAPTER 5. INTEGERS AND

4 Memory management and arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . 475 35.5 Execution latency, package loading and package precompiling time . . . . . . . . . 482 35.6 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1691 88.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1691 88.4 Reference . . . . . . changes in account. Alternatively, the precision or the rounding can be changed only within the execution of a particular block of code by using the same functions with a do block:CHAPTER 5. INTEGERS AND

4 Memory management and arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . 474 35.5 Execution latency, package loading and package precompiling time . . . . . . . . . 481 35.6 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1690 88.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1690 88.4 Reference . . . . . . changes in account. Alternatively, the precision or the rounding can be changed only within the execution of a particular block of code by using the same functions with a do block:CHAPTER 5. INTEGERS AND

4 Memory management and arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . 474 35.5 Execution latency, package loading and package precompiling time . . . . . . . . . 481 35.6 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1690 88.3 Triggered During Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1690 88.4 Reference . . . . . . changes in account. Alternatively, the precision or the rounding can be changed only within the execution of a particular block of code by using the same functions with a do block:CHAPTER 5. INTEGERS AND