boost add_pointer

本文介绍了Boost库中add_pointer模板类的使用方法及其内部实现原理。通过几个示例展示了如何为不同类型的对象添加指针层,适用于多种编程场景。

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template <class T>
struct add_pointer
{
   typedef see-below type;
};

type: 和remove_reference<T>::type*类型一样

此模板类的功能是构造一个和TYPEOF(&t)一样的类型,其中T是对象类型

头文件: #include <boost/type_traits/add_pointer.hpp> or #include <boost/type_traits.hpp>

Table 1.13. Examples

Expression

Result Type

add_pointer<int>::type

int*

add_pointer<int const&>::type

int const*

add_pointer<int*>::type

int**

add_pointer<int*&>::type

int**

实现细节:
template <typename T>
struct add_pointer_impl
{
    typedef typename remove_reference<T>::type no_ref_type;
    typedef no_ref_type* type;
};
template< typename T > struct add_pointer
{
    typedef typename add_pointer_impl<T>::type
type;
};
/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * <h2><center>© Copyright (c) 2025 STMicroelectronics. * All rights reserved.</center></h2> * * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "tim.h" #include "usart.h" #include "gpio.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "stdio.h" #include "string.h" #include "stdint.h" #include "stdlib.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ /* USER CODE BEGIN PV */ uint16_t Duty=100; uint16_t Step=20; uint8_t Mode = 0; uint8_t key1Pressed = 0; uint8_t RecBuf[100]; uint8_t RecBuf2[100]; uint8_t flag=0; /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); /* USER CODE BEGIN PFP */ void LED_contorl(unsigned char led_num,unsigned char led_on); void Breath_led(void); void Flow_led(void); void Manual_led(void); void Uart_led(void); /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); MX_TIM3_Init(); MX_TIM4_Init(); MX_USART1_UART_Init(); /* USER CODE BEGIN 2 */ HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_3); // HAL_UART_Receive_IT(&huart1, RecBuf2, 5); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ switch(Mode){ case 1:Breath_led(); break; case 2:Flow_led(); if(flag==1) { __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_3, 200); for(int i=1;i<=8;i++) { HAL_GPIO_WritePin(GPIOC,GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15,GPIO_PIN_SET); LED_contorl(i,1); HAL_Delay(500); } } break; case 3:Manual_led(); break; case 4:Uart_led(); break; } } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; RCC_PeriphCLKInitTypeDef PeriphClkInit = {0}; /** Configure the main internal regulator output voltage */ HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST); /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV6; RCC_OscInitStruct.PLL.PLLN = 85; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2; RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB buses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) { Error_Handler(); } /** Initializes the peripherals clocks */ PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1; PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2; if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) { Error_Handler(); } } /* USER CODE BEGIN 4 */ void LED_contorl(unsigned char led_num,unsigned char led_on) { if(led_on){ HAL_GPIO_WritePin(GPIOC,GPIO_PIN_8 << (led_num-1),GPIO_PIN_RESET); } else { HAL_GPIO_WritePin(GPIOC,GPIO_PIN_8 << (led_num-1),GPIO_PIN_SET); } HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET); } void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) { if(GPIO_Pin==GPIO_PIN_0) { Mode=(Mode %4 )+1; } else if(GPIO_Pin==GPIO_PIN_1 &&Mode==3) { if(Duty > 0) { Duty -= Step; __HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_3,Duty); } } else if(GPIO_Pin==GPIO_PIN_2 &&Mode==3) { if(Duty < 200) { Duty += Step; __HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_3,Duty); } } } void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) { if (htim->Instance == TIM4) { flag=1; } } void Breath_led(void) { for(Duty=0;Duty<=200;Duty=Duty+Step) { __HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_3,Duty); HAL_Delay(200); } for (Duty = 200; Duty > 0; Duty -= Step) { __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_3, Duty); HAL_Delay(100); } } void Flow_led(void) { __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_3, 200); HAL_Delay(1000); HAL_GPIO_WritePin(GPIOC,GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15,GPIO_PIN_RESET); HAL_TIM_Base_Start_IT(&htim4); } void Manual_led(void) { HAL_TIM_Base_Stop_IT(&htim4); for(int i=2; i<=8; i++) { LED_contorl(i, 0); } HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_3); HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET); __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_3, Duty); } void Uart_led(void) { __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_3, 200); HAL_UART_Receive_IT(&huart1,RecBuf2,5); } void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if(huart->Instance==USART1 && Mode==4) { if(RecBuf2[4]=='1') { // LED_contorl(2,1); for(Duty=0;Duty<=200;Duty=Duty+Step) { __HAL_TIM_SET_COMPARE(&htim3,TIM_CHANNEL_3,Duty); HAL_Delay(200); } for (Duty = 200; Duty > 0; Duty -= Step) { __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_3, Duty); HAL_Delay(100); } } if(RecBuf2[4]=='2') { for(int i=1;i<=8;i++) { HAL_GPIO_WritePin(GPIOC,GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15,GPIO_PIN_SET); LED_contorl(i,1); HAL_Delay(500); } } } } int fputc(int ch,FILE *f) { HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,HAL_MAX_DELAY); return ch; } /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ __disable_irq(); while (1) { } /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ 为什么当我在串口输入mode2时里面的for循环没有执行
06-19
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