C++ 结构和函数声明。为什么不编译?
C++ struct and function declaration. Why doesn't it compile?
这个编译很好(Arduino):
struct ProgressStore {
unsigned long ProgressStart;
unsigned long LastStored;
uint32_t FirstSectorNr;
};
void IRAM_ATTR ProgressInit(ProgressStore aProgressStore){
}
省略 IRAM_ATTR 它不再编译(?):
Verbruiksmeter:116:6: error: variable or field 'ProgressInit' declared void
116 | void ProgressInit(ProgressStore aProgressStore){//, uint32_t SectorNr) {
| ^~~~~~~~~~~~
Verbruiksmeter:116:19: error: 'ProgressStore' was not declared in this scope
116 | void ProgressInit(ProgressStore aProgressStore){//, uint32_t SectorNr) {
| ^~~~~~~~~~~~~
看这里:
Arduino 的意思是它在 main 中找到您所有的函数定义,并在其余代码之上为每个函数生成一个函数声明。结果是您在声明 ProgressStore 结构之前尝试使用 ProgressStore。我相信 IRAM_ATTR 必须抑制这种行为。
它最终在编译之前生成了这个:
void ProgressInit(ProgressStore aProgressStore); // <-- ProgressStore not yet declared
struct ProgressStore {
unsigned long ProgressStart; //Value of the counter at the start of the sector
unsigned long LastStored; //Should be new CounterValue-1, but you never know...
uint32_t FirstSectorNr; //1st of 2 sectors used for storage of progress
};
void ProgressInit(ProgressStore aProgressStore) {//, uint32_t SectorNr) {
// ProgressStore.1stSector = SectorNr;
}
一个解决方案是将您的结构和 类 移动到它们自己的 .h
文件中,并将它们包含在顶部。
ProgressStore.h
#ifndef PROGRESS_STORE_H
#define PROGRESS_STORE_H
struct ProgressStore {
unsigned long ProgressStart; //Value of the counter at the start of the sector
unsigned long LastStored; //Should be new CounterValue-1, but you never know...
uint32_t FirstSectorNr; //1st of 2 sectors used for storage of progress
};
#endif // PROGRESS_STORE_H
main.cpp
#include "ProgressStore.h"
void ProgressInit(ProgressStore aProgressStore) {//, uint32_t SectorNr) {
// ProgressStore.1stSector = SectorNr;
}
函数声明仍然是自动生成的,但插入在您的 #include
s
之后
这个编译很好(Arduino):
struct ProgressStore {
unsigned long ProgressStart;
unsigned long LastStored;
uint32_t FirstSectorNr;
};
void IRAM_ATTR ProgressInit(ProgressStore aProgressStore){
}
省略 IRAM_ATTR 它不再编译(?):
Verbruiksmeter:116:6: error: variable or field 'ProgressInit' declared void
116 | void ProgressInit(ProgressStore aProgressStore){//, uint32_t SectorNr) {
| ^~~~~~~~~~~~
Verbruiksmeter:116:19: error: 'ProgressStore' was not declared in this scope
116 | void ProgressInit(ProgressStore aProgressStore){//, uint32_t SectorNr) {
| ^~~~~~~~~~~~~
看这里:
Arduino 的意思是它在 main 中找到您所有的函数定义,并在其余代码之上为每个函数生成一个函数声明。结果是您在声明 ProgressStore 结构之前尝试使用 ProgressStore。我相信 IRAM_ATTR 必须抑制这种行为。
它最终在编译之前生成了这个:
void ProgressInit(ProgressStore aProgressStore); // <-- ProgressStore not yet declared
struct ProgressStore {
unsigned long ProgressStart; //Value of the counter at the start of the sector
unsigned long LastStored; //Should be new CounterValue-1, but you never know...
uint32_t FirstSectorNr; //1st of 2 sectors used for storage of progress
};
void ProgressInit(ProgressStore aProgressStore) {//, uint32_t SectorNr) {
// ProgressStore.1stSector = SectorNr;
}
一个解决方案是将您的结构和 类 移动到它们自己的 .h
文件中,并将它们包含在顶部。
ProgressStore.h
#ifndef PROGRESS_STORE_H
#define PROGRESS_STORE_H
struct ProgressStore {
unsigned long ProgressStart; //Value of the counter at the start of the sector
unsigned long LastStored; //Should be new CounterValue-1, but you never know...
uint32_t FirstSectorNr; //1st of 2 sectors used for storage of progress
};
#endif // PROGRESS_STORE_H
main.cpp
#include "ProgressStore.h"
void ProgressInit(ProgressStore aProgressStore) {//, uint32_t SectorNr) {
// ProgressStore.1stSector = SectorNr;
}
函数声明仍然是自动生成的,但插入在您的 #include
s