[英]Solving a C2039 error and a C3861 error using std::minmax_element
我是 C++ 的新手。
我在標准 VS2019 測試項目中的測試函數中編寫了以下行:
auto minAndMaxYards = std::minmax_element(simResults.begin(), simResults.end());
即使智能感知將其識別為 std 的成員,它也會為 minmax_element 函數產生 C2039 和 C3861 錯誤,我可以查看它的定義。 我無法弄清楚我錯過了什么。 我在測試項目的頂部也包含了算法文件。
是否有我不正確的項目設置?
完整的錯誤文本:
C2039 'minmax_element': 不是 'std' 的成員
C3861 'minmax_element': 未找到標識符
編輯,包括代碼以防萬一
#include <algorithm>
#include "pch.h"
#include "CppUnitTest.h"
#include "Playbook.h"
#include "PlaySim.h"
using namespace Microsoft::VisualStudio::CppUnitTestFramework;
std::string output;
using std::vector;
namespace FootballDynastyV20UnitTest
{
TEST_CLASS(PlaybookIO)
{
public:
TEST_METHOD(setAndGetPlayblookName)
{
Playbook testPlays;
string testName = "testPlays";
testPlays.setName(testName);
string name = testPlays.getName();
Assert::IsTrue(name == testName);
}
TEST_METHOD(addPlayIncrementsPlayNum)
{
Playbook testPlays;
string playName = "Play1";
int numDLine = 4;
int numLB = 3;
vector<int> playerPos = { 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 19 };
vector<int> playerStance = { 2, 1, 0, 0, 1, 2, 2, 3, 2, 3, 3 };
vector<int> playerBlitzGaps = { 0, 3, 0, 0, 3, 0, 0, 0, 0, 0, 0 };
testPlays.setName("testPlays");
testPlays.addPlay(playName, numDLine, numLB, playerPos, playerStance, playerBlitzGaps);
Assert::IsTrue(testPlays.getNumPlays() == 1);
}
TEST_METHOD(saveAndLoadPlayblook)
{
Playbook testPlays;
Playbook testPlaysLoad;
string playName = "Play1";
int numDLine = 4;
int numLB = 3;
vector<int> playerPos = { 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 19 };
vector<int> playerStance = { 2, 1, 0, 0, 1, 2, 2, 3, 2, 3, 3 };
vector<int> playerBlitzGaps = { 0, 3, 0, 0, 3, 0, 0, 0, 0, 0, 0 };
testPlays.setName("testPlays");
testPlays.addPlay(playName, numDLine, numLB, playerPos, playerStance, playerBlitzGaps);
testPlays.save();
testPlaysLoad.load(testPlays.getName());
Assert::IsTrue(testPlays == testPlaysLoad);
}
};
TEST_CLASS(PlaySimTesting)
{
public:
TEST_METHOD(playSimReturnsYdsGainedBetweenNegative10And40)
{
PlaySim newPlay;
int numSims = 2000;
int lwrBound = -10;
int uprBound = 40;
vector<int> simResults;
for (int i = 0; i < numSims; i++)
{
newPlay.Run();
simResults.push_back(newPlay.GetYds());
}
auto minAndMaxYards = std::minmax_element(simResults.begin(), simResults.end());
int actualMin = *minAndMaxYards.first;
int actualMax = *minAndMaxYards.second;
int yds = newPlay.GetYds();
Assert::IsTrue((actualMin >= lwrBound) && (actualMax <= uprBound));
}
};
}
將#include "pch.h"
移至文件頂部。 使用預編譯頭時,編譯器會忽略此行以上的所有內容。 在您的示例中,這將是#include <algorithm>
,這就是未找到std::minmax_element
的原因。
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