vault backup: 2023-03-20 12:19:51
This commit is contained in:
54
.obsidian/workspace.json
vendored
54
.obsidian/workspace.json
vendored
@@ -34,45 +34,9 @@
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"lastOpenFiles": [
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"03. 專注Study/Android/MediaCodec.md",
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"04. Programming/Kotlin/AtomicBoolean.md",
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"03. 專注Study/Android/Android programming.md",
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"01. 個人/00. Informations/Datas.md",
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"03. 專注Study/C++/C++20.md",
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"03. 專注Study/Android/MediaCodec.md",
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"03. 專注Study/Android/Android External Storage - Read, Write, Save File.md",
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@@ -224,7 +189,6 @@
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"01. 個人/01. Daily/2023/02",
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"02. 工作/01. Logitech/QA Sustaining Automation.md",
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"01. 個人/01. Daily/2023/02/2023-02-22(週三).md",
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"00. Inbox/Habit Tracker.md",
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"01. 個人/01. Daily/2023/02/2023-02-12(週日).md"
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"00. Inbox/Habit Tracker.md"
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]
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}
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@@ -1,5 +1,10 @@
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# ME
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## 一般
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- [ ] 深入Android programming
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- 參考：[Modern Android App Development in 2023 | by Jorge Luis Castro Medina | Medium](https://devjorgecastro.medium.com/modern-android-app-development-in-2023-ff445d3652b4)
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- [ ] 課程：[Android Compose 教學課程 | Android Developers](https://developer.android.com/jetpack/compose/tutorial?hl=zh-tw)
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- [ ] [適用於 Android 開發人員的 Jetpack Compose | Android Developers](https://developer.android.com/courses/jetpack-compose/course?hl=zh-tw)
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- [ ] [Getting Started with CameraX](https://developer.android.com/codelabs/camerax-getting-started#1)
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- [ ] 想買定焦鏡
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- [ ] [XF18mmF2 R](https://www.fujifilm.com.tw/personal/digitalcamera/fujinon_lens_xf18mmf2_r/index.html)
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- 公司貨 $18000；[FUJINON XF18mm F2 R 鏡頭 - PChome 24h購物](https://24h.pchome.com.tw/prod/ABAQ07-A69947577)
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97
03. 專注Study/C++/C++20.md
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97
03. 專注Study/C++/C++20.md
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@@ -0,0 +1,97 @@
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## Modules
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Modules provide a new way to organize and manage large codebases, helping to improve build times, reduce code duplication, and increase modularity.
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```cpp
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// Example: math.cppm
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export module math;
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export int square(int x) {
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return x * x;
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}
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export int cube(int x) {
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return x * x * x;
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}
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// Example: main.cpp
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import math;
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int main() {
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int result = math::square(5);
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// result = 25
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int result2 = math::cube(5);
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// result2 = 125
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}
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```
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## Concepts
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Concepts provide a way to specify **_constraints_** on templates, making it easier to write **_generic_** code that works with a wide range of types.
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```cpp
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template <typename T>
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concept Addable = requires(T a, T b) {
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{ a + b } -> T;
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};
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template <Addable T>
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T add(T a, T b) {
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return a + b;
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}
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int main() {
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int x = 1, y = 2;
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auto result = add(x, y);
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// result = 3
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}
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```
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## Ranges
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Ranges provide a new way to manipulate **_sequences_** of data in C++, making it easier to write clean, readable, and efficient code.
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```cpp
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#include <ranges>
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#include <iostream>
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int main() {
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std::vector<int> v{1, 2, 3, 4, 5};
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auto even = v | std::ranges::views::filter([](int x) { return x % 2 == 0; });
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for (int x : even) {
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std::cout << x << '\n';
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}
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}
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```
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## Contract Programming
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Contract programming allows developers to specify **_preconditions_**, **_postconditions_**, and **_assertions_** in their code, making it easier to **catch** bugs early and reduce the number of runtime errors.
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```cpp
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#include <iostream>
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[[nodiscard]] int foo() {
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return 42;
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}
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int main() {
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int x = foo();
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std::cout << x << '\n';
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}
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```
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## Improved Template Metaprogramming
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C++20 includes several imrovements to the way templates can be used in C++, making it easier to write **generic** code that can be used with a wide range of types.
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```cpp
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#include <type_traits>
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template <typename T>
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struct is_integral : std::false_type {};
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template <>
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struct is_integral<int> : std::true_type {};
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int main() {
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static_assert(is_integral<int>::value, "");
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static_assert(!is_integral<float>::value, "");
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}
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```
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