0
私は擬似メディアセンターを作成しようとしています Arduinoとブレッドボードでは、複雑ではありませんが、これは私の最初のプロジェクトですC++は「Hello world！」以上のものでしたまたは計算機。非constexpr関数の呼び出し 'std :: map ...'
元のプログラム全体のほとんどを書き直し始めました。物事を整理するために、キーと値（IRコード）を保持するために地図を使い始めました。関数（IR_generateMap（））の内部での割り当てが、コンパイル時にエラーが発生します。
C:\Users\trevo\Documents\Arduino\improvedIRRemote\improvedIRRemote.ino: In function 'void IRLoop(bool)':
improvedIRRemote:78: error: call to non-constexpr function 'std::map<Key, T, Compare, Allocator>::reference std::map<Key, T, Compare, Allocator>::operator[](const key_type&) [with Key = std::basic_string<char>; T = int; Compare = std::less<std::basic_string<char> >; Allocator = std::allocator<int>; std::map<Key, T, Compare, Allocator>::reference = int&; std::map<Key, T, Compare, Allocator>::key_type = std::basic_string<char>]'
case IRCodes["Power Button"]:
^
improvedIRRemote:78: error: call to non-constexpr function 'std::map<Key, T, Compare, Allocator>::reference std::map<Key, T, Compare, Allocator>::operator[](const key_type&) [with Key = std::basic_string<char>; T = int; Compare = std::less<std::basic_string<char> >; Allocator = std::allocator<int>; std::map<Key, T, Compare, Allocator>::reference = int&; std::map<Key, T, Compare, Allocator>::key_type = std::basic_string<char>]'
exit status 1
call to non-constexpr function 'std::map<Key, T, Compare, Allocator>::reference std::map<Key, T, Compare, Allocator>::operator[](const key_type&) [with Key = std::basic_string<char>; T = int; Compare = std::less<std::basic_string<char> >; Allocator = std::allocator<int>; std::map<Key, T, Compare, Allocator>::reference = int&; std::map<Key, T, Compare, Allocator>::key_type = std::basic_string<char>]'
私が見上げると非constexprの呼び出しでエラーを理解しようとしましたが、完全に正直に言うと、私は私がマップでやろうとしていることであることの問題にどのように関係するかを理解していないしました上記のエラーに対処する記事に記載されています。
#include <IRremote.h>
#include <StandardCplusplus.h>
#include <map>
//Variables responsible for recieving and decoding IR signals/codes.
IRrecv receiver(10); //IR receiver initialization.
decode_results results; //Object that is responsible for decoding the IR signal.
//Variables responsible for tracking channel changing.
int channel = 1; //The active channel.
int desiredChannel = ""; //The string that is used to concatenate the numbers pressed on the remote keypad together.
int channelEnterDelay = 4000; //The delay between the last time a number was pressed on the remote keypad and when the desiredChannel is cleared.
unsigned long channelEnterStartTime = 0; //The time in which that last number was pressed on the remote keypad.
String intConverter; //The string responsible for casting an integer to a string.
//Variables responsible for tracking volume changing.
int volume = 50; //The current volume.
int lastVolume = 50; //Holds the value of the volume previous to the volume being muted.
bool isMuted = false; //Whether or not the sound has been muted.
//Map responsible for the setting and getting of IR codes and their respective keys.
const std::map<std::string, int> IRCodes;
//Miscellanious Stuff - mostly waiting for depreciation.
int IRFlasherPin = 8;
int mode = 0;
int IRFlasherBlinkRate = 10;
//Debug mode shows channel switching info when entering from the remote keypad, turn it off to declutter the serial feed if it is not being used.
bool DEBUG_MODE = false;
void setup() {
receiver.enableIRIn(); //Tells the receiver to start listening for IR communication.
pinMode(IRFlasherPin, OUTPUT); //Configuring the pin that flashes upon recieving the 'excess communication' IR code.
Serial.begin(9600); //Begins serial communication at 9600 baud.
IR_generateMap(); //Sets all of the values for the map of IR keys and values.
//Ready message.
Serial.println("The Arduino is ON and ready for communication.");
if (DEBUG_MODE) { Serial.println("Also please note that debug mode has been preemptively enabled. The serial monitor can be expected to be much more cluttered than normal. To disable this, press the 'U/SD' button on the remote."); }
Serial.println();
}
void loop() {
//Pre-loop checks.
//empty
IRLoop(true);
}
void IRLoop(bool toldToContinueLooking) {
if (receiver.decode(&results)) {
switch(results.value) {
case IRCodes["Power Button"]:
Serial.println("Power Toggle");
break;
default:
if (DEBUG_MODE) {
Serial.print("Extraneous code: ");
Serial.print(results.value);
}
break;
}
}
if (toldToContinueLooking) { receiver.resume(); }
}
void IR_generateMap() {
//General Keys
IRCodes["Power Button"] = 16753245;
IRCodes["Mode Button"] = 16736925;
IRCodes["Back Button"] = 16750695;
IRCodes["EQ Button"] = 16769055;
IRCodes["USD Button"] = 16756815;
//Media Keys
IRCodes["PlayPause Button"] = 16720605;
IRCodes["Rewind Button"] = 16712445;
IRCodes["Fast Forward Button"] = 16761405;
//Volume Keys
IRCodes["Mute Button"] = 16769565;
IRCodes["Minus Button"] = 16754775;
IRCodes["Plus Button"] = 16748655;
//Numpad Keys
IRCodes["Numpad 0"] = 16738455;
IRCodes["Numpad 1"] = 16724175;
IRCodes["Numpad 2"] = 16718055;
IRCodes["Numpad 3"] = 16743045;
IRCodes["Numpad 4"] = 16716015;
IRCodes["Numpad 5"] = 16726215;
IRCodes["Numpad 6"] = 16734885;
IRCodes["Numpad 7"] = 16728765;
IRCodes["Numpad 8"] = 16730805;
IRCodes["Numpad 9"] = 16732845;
//Non-Key Codes
IRCodes["Excess Communication"] = 4294967295;
}
私の初期のC++知識ベースの誰かが理解できるという点で、私が間違っていることを誰かが説明できますか？