C++的枚舉顯示錯誤：「非靜態成員引用必須相對於特定對象。」

-1

所以，我正在編寫一個代碼來計算基於銀行交易的金額。我創建了一個枚舉類來標識SALE = 1，VALUEADDED = 2，CREDIT = TransactionType是枚舉。C++的枚舉顯示錯誤：「非靜態成員引用必須相對於特定對象。」

class transaction { 
public: 
    enum class TransactionType { sale = 1, valueadded, credit, cancel, promo, discount, interterritory }; 
    transaction(int transactionId, int salerepId, int transactionType, int amount) { 
     this->transactionId = transactionId; 
     this->salerepId = salerepId; 
     this->transactionType = static_cast<TransactionType>(transactionType); 
     this->amount = amount; 
    } 

    void print() { 
     cout << transactionId << "\t\t" << salerepId << "\t\t"; 
     switch (transactionType) 
     { 
     case TransactionType::sale: 
      cout << "SALE"; 
      break; 
     case TransactionType::valueadded: 
      cout << "VALUEADDED"; 
      break; 
     case TransactionType::credit: 
      cout << "CREDIT"; 
      break; 
     case TransactionType::cancel: 
      cout << "CANCEL"; 
      break; 
     case TransactionType::promo: 
      cout << "PROMO"; 
      break; 
     case TransactionType::discount: 
      cout << "DISCOUNT"; 
      break; 
     case TransactionType::interterritory: 
      cout << "INTERTERRIOTY"; 
      break; 
     default: 
      cout << "UNIDENTIFIED"; 
      break; 
     } 
     cout << "\t\t" << amount << endl; 
    } 
    TransactionType transactionType; 
private: 
    int transactionId; 
    int salerepId; 
    int amount; 

};

下面的代碼是我想根據什麼類型的交易來計算金額。（Territory_output是給出金額輸出的另一個類，salerep :: amount是來自不同類的另一個實例，它提供了初始金額）。

territory_output tAmount; 
if (transaction::transactionType == transaction::TransactionType::sale) { 
    tAmount.territoryAmount += salerep::amount * 1.1; 
    return tAmount.territoryAmount; 
} 
if (transaction::transactionType == transaction::TransactionType::valueadded) { 
    tAmount.territoryAmount += salerep::amount * 1.1; 
    return tAmount.territoryAmount; 
} 
if (transaction::transactionType == transaction::TransactionType::credit) { 
    tAmount.territoryAmount -= salerep::amount * 1; 
    return tAmount.territoryAmount; 
} 
if (transaction::transactionType == transaction::TransactionType::cancel) { 
    tAmount.territoryAmount -= salerep::amount * 1.25; 
    return tAmount.territoryAmount; 
} 
if (transaction::transactionType == transaction::TransactionType::promo) { 
    tAmount.territoryAmount -= salerep::amount * 0; 
    return tAmount.territoryAmount; 
} 
if (transaction::transactionType == transaction::TransactionType::discount) { 
    tAmount.territoryAmount -= salerep::amount *1.1; 
    return tAmount.territoryAmount; 
} 
if (transaction::transactionType == transaction::TransactionType::interterritory) { 
    tAmount.territoryAmount += salerep::amount *0.75; 
    return tAmount.territoryAmount; 
}

我得到一個錯誤「非靜態成員引用必須是相對於特定對象。」用於將transaction :: TransactionType作爲枚舉進行調用。和我得到相同的錯誤「非靜態成員引用必須相對於特定的對象。」 for salerep ::金額。有人可以幫忙嗎？這是表格的圖片，用於說明歸屬。 The table of Transaction Type & Attribution Rule

來源

2017-04-24 Sida Zhang

它不是'enum' - 你'transaction'類沒有名爲'transactionType' – UnholySheep

你想指與'交易:: transactionType'什麼'static'會員？ – user463035818

transaction::transactionType將是一個有效的表達式transactionType已成爲static類的成員。由於transactionType是該類的非static成員，因此只能在對象的上下文中使用。

E.g.

transaction tr; 
if (tr.transactionType == transaction::TransactionType::sale) {

您還沒有表現出類salerep的定義，但我從同樣的問題猜測salerep::amount受到影響。您需要一個salerep類型的對象，並使用.語法訪問其成員。

salerep rep; 

... 

if (tr.transactionType == transaction::TransactionType::sale) { 
    tAmount.territoryAmount += rep.amount * 1.1; 
    return tAmount.territoryAmount; 
}

來源

2017-04-24 18:33:50

所以，我在課堂上還是在主要功能中陳述'transaction tr;'。 –

@SidaZhang，我不知道如何在沒有[mcve]的情況下回答這個問題。 –

C++的枚舉顯示錯誤：「非靜態成員引用必須相對於特定對象。」

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