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我目前正在與PC-Lint(版本9.00j和l)苦苦掙扎,這給了我一些錯誤和一段代碼的警告。代碼編譯良好並按預期運行。下面是它的一個簡化版本:成員模板奇怪的PC-Lint錯誤
#include <iostream>
#include <vector>
typedef unsigned char uint8_t;
class Test
{
uint8_t inputList[10];
std::vector<int> resultList;
public:
Test() : resultList()
{
for (uint8_t ii = 0; ii < 10; ++ii)
inputList[ii] = ii;
}
template<int list_size, typename ResultListType>
void loadList(const uint8_t (& inputList)[list_size],
ResultListType & resultList) const
{
for (uint8_t ii = 0; ii < list_size; ++ii)
resultList.push_back(inputList[ii]);
}
void run()
{
loadList(inputList, resultList);
}
void print()
{
std::vector<int>::iterator it;
for (it = resultList.begin(); it != resultList.end(); ++it)
std::cout << *it << std::endl;
}
};
int main()
{
Test t;
t.run();
t.print();
}
當金培爾的在線演示運行此,我得到這些錯誤和警告:
30 loadList(inputList, resultList);
diy.cpp 30 Error 1025: No template matches invocation 'Test::loadList(unsigned char [10], std::vector<int>)', 1 candidates found, 1 matched the argument count
diy.cpp 30 Info 1703: Function 'Test::loadList(const unsigned char (&)[V], <2>&) const' arbitrarily selected. Refer to Error 1025
diy.cpp 30 Error 1032: Member 'loadList' cannot be called without object
diy.cpp 30 Error 1058: While calling 'Test::loadList(const unsigned char (&)[V], <2>&) const': Initializing a non-const reference '<2>&' with a non-lvalue (a temporary object of type 'std::vector<int>')
diy.cpp 30 Warning 1514: Creating temporary to copy 'std::vector<int>' to '<2>&' (context: arg. no. 2)
所以基本上,PC-Lint是想告訴我,這將偶然找到正確的模板參數,並且只填充矢量的臨時副本。但是代碼運行良好,resultList包含數據!
任何人都可以告訴我這裏發生了什麼? PC-Lint是否正確,有什麼問題或者這只是一個PC-Lint的bug?
當忽略該const時,我會得到相同的錯誤/警告。我添加了它,因爲它在錯誤描述[1058](http://gimpel-online.com/MsgRef.html#1058)中提到 – craesh
@craesh如果你明確地指定了模板參數,它確實工作正常, oadList <10,std :: vector>(inputList,resultList)'。我謹慎地說這是PC-lint中模板匹配和重載分辨率的問題。 –
它甚至可以工作,如果我只是指定第一個參數,大小。我記得前一段時間有類似的問題,它是由'lint -fvl'解決的。可變長度數組是GNU擴展,在默認的lint config中默認啓用... – craesh