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T230428 Extra Parentheses, Different Meaning

今天说一下额外 () 产生不同意义的情况。多数情况下，额外的()是不影响语义的，但在以下 5 种情况，有无 () 则意义不同，此时 () 就有了特殊的作用。禁止 ADL。在「洞悉 C++ 函数重… Continue Reading T230428 Extra Parentheses, Different Meaning

Posted on: April 28, 2023 July 24, 2023
Author: 里缪
Categories: TodayGroupShared
Tags: ADL, Comma operator, Macros, Value categories, Vexing parses problem
Views 790

T230420 Unconditional compile-time expression

今天说两个关于编译期的小技巧。看如下例子： struct S { int val; constexpr int size() const { return val * (val + 1) / 2; … Continue Reading T230420 Unconditional compile-time expression

Posted on: April 20, 2023 July 24, 2023
Author: 里缪
Categories: TodayGroupShared
Tags: C++20, Constant expressions, NTTP, Tricks
Views 337

T230418 explicit(bool)

explicit(bool) 是 C++20 引入的一个特性，称为 Conditionally explicit。核心目的是简化泛型类型的实现，提高性能，减少编译时间。举个简单的例子： void … Continue Reading T230418 explicit(bool)

Posted on: April 18, 2023 July 24, 2023
Author: 里缪
Categories: TodayGroupShared
Tags: C++20, explicit(bool)
Views 320