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c++中move语义是什么_c++移动语义原理与示例

时间:2025-11-28 18:15:11

c++中move语义是什么_c++移动语义原理与示例
首先,你需要全局安装http-server:npm install -g http-server然后,在你的项目目录下运行:http-server这也会启动一个本地服务器,你可以在浏览器中通过http://localhost:8080(默认端口)访问你的HTML文件。
通过结合 Selenium 的页面加载能力和 requests 库或 base64 库的数据处理能力,可以有效地从网页中提取并保存图片资源。
返回类型合理设计:如赋值返回自身引用,前置++也返回引用,而后置++返回副本。
示例代码是什么?
PHP扩展并非跨版本或跨架构兼容。
在C++中,static_cast 和 dynamic_cast 是两种常用的类型转换操作符,它们各有适用场景和潜在风险。
修改后的 __init__ 方法如下:class AESCipher(object): def __init__(self, key=None): # Initialize the AESCipher object with a key, # defaulting to a randomly generated key self.block_size = AES.block_size if key: self.key = b64decode(key.encode()) else: self.key = Random.new().read(self.block_size)完整代码示例 以下是修改后的完整代码示例:import hashlib from Crypto.Cipher import AES from Crypto import Random from base64 import b64encode, b64decode class AESCipher(object): def __init__(self, key=None): # Initialize the AESCipher object with a key, # defaulting to a randomly generated key self.block_size = AES.block_size if key: self.key = b64decode(key.encode()) else: self.key = Random.new().read(self.block_size) def encrypt(self, plain_text): # Encrypt the provided plaintext using AES in CBC mode plain_text = self.__pad(plain_text) iv = Random.new().read(self.block_size) cipher = AES.new(self.key, AES.MODE_CBC, iv) encrypted_text = cipher.encrypt(plain_text) # Combine IV and encrypted text, then base64 encode for safe representation return b64encode(iv + encrypted_text).decode("utf-8") def decrypt(self, encrypted_text): # Decrypt the provided ciphertext using AES in CBC mode encrypted_text = b64decode(encrypted_text) iv = encrypted_text[:self.block_size] cipher = AES.new(self.key, AES.MODE_CBC, iv) plain_text = cipher.decrypt(encrypted_text[self.block_size:]) return self.__unpad(plain_text) def get_key(self): # Get the base64 encoded representation of the key return b64encode(self.key).decode("utf-8") def __pad(self, plain_text): # Add PKCS7 padding to the plaintext number_of_bytes_to_pad = self.block_size - len(plain_text) % self.block_size padding_bytes = bytes([number_of_bytes_to_pad] * number_of_bytes_to_pad) padded_plain_text = plain_text.encode() + padding_bytes return padded_plain_text @staticmethod def __unpad(plain_text): # Remove PKCS7 padding from the plaintext last_byte = plain_text[-1] return plain_text[:-last_byte] if isinstance(last_byte, int) else plain_text def save_to_notepad(text, key, filename): # Save encrypted text and key to a file with open(filename, 'w') as file: file.write(f"Key: {key}\nEncrypted text: {text}") print(f"Text and key saved to {filename}") def encrypt_and_save(): # Take user input, encrypt, and save to a file user_input = "" while not user_input: user_input = input("Enter the plaintext: ") aes_cipher = AESCipher() # Randomly generated key encrypted_text = aes_cipher.encrypt(user_input) key = aes_cipher.get_key() filename = input("Enter the filename (including .txt extension): ") save_to_notepad(encrypted_text, key, filename) def decrypt_from_file(): # Decrypt encrypted text from a file using a key filename = input("Enter the filename to decrypt (including .txt extension): ") with open(filename, 'r') as file: lines = file.readlines() key = lines[0].split(":")[1].strip() encrypted_text = lines[1].split(":")[1].strip() aes_cipher = AESCipher(key) decrypted_bytes = aes_cipher.decrypt(encrypted_text) # Decoding only if the decrypted bytes are not empty decrypted_text = decrypted_bytes.decode("utf-8") if decrypted_bytes else "" print("Decrypted Text:", decrypted_text) def encrypt_and_decrypt_in_command_line(): # Encrypt and then decrypt user input in the command line user_input = "" while not user_input: user_input = input("Enter the plaintext: ") aes_cipher = AESCipher() encrypted_text = aes_cipher.encrypt(user_input) key = aes_cipher.get_key() print("Key:", key) print("Encrypted Text:", encrypted_text) decrypted_bytes = aes_cipher.decrypt(encrypted_text) decrypted_text = decrypted_bytes.decode("utf-8") if decrypted_bytes else "" print("Decrypted Text:", decrypted_text) # Menu Interface while True: print("\nMenu:") print("1. Encrypt and save to file") print("2. Decrypt from file") print("3. Encrypt and decrypt in command line") print("4. Exit") choice = input("Enter your choice (1, 2, 3, or 4): ") if choice == '1': encrypt_and_save() elif choice == '2': decrypt_from_file() elif choice == '3': encrypt_and_decrypt_in_command_line() elif choice == '4': print("Exiting the program. Goodbye!") break else: print("Invalid choice. Please enter 1, 2, 3, or 4.")注意事项 密钥管理: 密钥的安全至关重要。
JavaScript 端的修改:解析 JSON 数据并添加到下拉菜单 接下来,需要修改 JavaScript 代码,以便能够正确解析 JSON 数据,并将每个模型数据作为单独的选项添加到下拉菜单中。
示例 XML 文档(books.xml): <library>   <book category="fiction">     <title>The Great Gatsby</title>     <author>F. Scott Fitzgerald</author>   </book>   <book category="science">     <title>A Brief History of Time</title>     <author>Stephen Hawking</author>   </book>   <book category="fiction">     <title>1984</title>     <author>George Orwell</author>   </book> </library> XPath 表达式示例: count(/library/book):返回 book 节点的总数,结果为 3。
注册 Activation 类 Activation类没有可训练参数,只有静态信息(即无)。
113 查看详情 利用工具分析依赖图谱 执行go list -m all查看当前模块所有直接和间接依赖。
锁的粒度:尽量缩小锁的范围,只保护真正需要同步的代码块。
当DataFrame的某一列可能包含列表类型的数据时,这种条件判断会变得稍微复杂。
下面详细介绍如何实现多继承以及需要注意的问题。
掌握这些函数,就能写出结构清晰、稳定可靠的 Python 单元测试。
它避免了冗余的结构体定义,简化了代码,并提高了开发效率。
PowerShell/CMD示例:cd C:\Users\myname\AppData\Roaming\Python\Python312\Scripts Git Bash示例:cd /c/Users/myname/AppData/Roaming/Python/Python312/Scripts 执行gdown命令: 在当前目录下,使用.\gdown(PowerShell/CMD)或./gdown(Git Bash)来调用。
然而,通常建议使用单个清晰的GOPATH以避免混淆。
其原理是在请求资源的URL后面添加一个每次请求都不同的查询参数。
不复杂但容易忽略细节。

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