Arduino编写库函数Library出错，求解？
ino文件编译没问题，下载到板子上也是正常的，本想建立一个库函数，方便以后调用，分成.cpp和.h编译出错，检查了很多遍，网上和自建库函数有关的帖子也都看过，Arduino.cc的教程也反复看了几遍，有关书籍也看了，还是不能解决。下面是IDE 1.6.8 报错的信息：
Arduino:1.6.8 (Windows 7), 开发板："Arduino Nano, ATmega328"
In file included from D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Print.h:27:0,
from D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Stream.h:26,
from D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\libraries\Wire\src/Wire.h:26,
from D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:3:
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Printable.h:25:1: error: unknown type name 'class'
class Print;
^
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Printable.h:33:1: error: unknown type name 'class'
class Printable
^
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Printable.h:34:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
{
^
In file included from D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Stream.h:26:0,
from D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\libraries\Wire\src/Wire.h:26,
from D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:3:
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Print.h:34:1: error: unknown type name 'class'
class Print
^
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Print.h:35:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
{
^
In file included from D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\libraries\Wire\src/Wire.h:26:0,
from D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:3:
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Stream.h:49:1: error: unknown type name 'class'
class Stream : public Print
^
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\cores\arduino/Stream.h:49:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
class Stream : public Print
^
In file included from D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:3:0:
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\libraries\Wire\src/Wire.h:33:1: error: unknown type name 'class'
class TwoWire : public Stream
^
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\libraries\Wire\src/Wire.h:33:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
class TwoWire : public Stream
^
D:\arduino-1.6.8-windows\arduino-1.6.8\hardware\arduino\avr\libraries\Wire\src/Wire.h:82:1: error: unknown type name 'TwoWire'
extern TwoWire Wire;
^
In file included from D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:4:0:
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811/CCS811.h:41:1: error: unknown type name 'class'
class CCS811
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811/CCS811.h:42:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
{
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:7:7: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
CCS811::CCS811()
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:14:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
voidCCS811::begin() {
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:19:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
boolCCS811::_HardWare_ID(){
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:39:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
boolCCS811::_Valid_Firmware(){
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:62:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
void CCS811::_Boot_to_Firmware_Mode(){
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:70:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
voidCCS811::_Measure_Mode(){
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:83:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
unsigned intCCS811::Read_Value(CCS811MeasureType type){
^
D:\arduino-1.6.8-windows\arduino-1.6.8\libraries\CCS811\CCS811.c:137:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
voidCCS811::init_CCS811(){
^
exit status 1
Error compiling for board Arduino Nano.
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