这是我正在运行的代码:
std::vector<std::vector<double>> test;
test.push_back(std::vector<double>(30));
std::vector<std::vector<double> >::iterator it=test.begin(), end=test.end();
while (it!=end) {
std::vector<double>::iterator it1=it->first.begin(),end1=it->first.end();
while (it1!=end1) {
std::copy(it1.begin(),it1.end(),std::ostream_iterator<double>(std::cout, " "));
++it1;
}
++it;
}
这是我得到的编译错误:
data.cpp:33:45: error: ‘class std::vector<double>’ has no member named ‘first’
data.cpp:33:68: error: ‘class std::vector<double>’ has no member named ‘first’
data.cpp:35:16: error: ‘class std::vector<double>::iterator’ has no member named ‘begin’
data.cpp:35:28: error: ‘class std::vector<double>::iterator’ has no member named ‘end’
data.cpp:35:34: error: ‘ostream_iterator’ is not a member of ‘std’
data.cpp:35:56: error: expected primary-expression before ‘double'
有关如何修复它的任何建议,以便我可以打印测试内容
我认为这更符合您的要求。
std::vector<std::vector<double>> test;
// Put some actual data into the test vector of vectors
for(int i = 0; i < 5; ++i)
{
std::vector<double> random_stuff;
for(int j = 0; j < 1 + i; ++j)
{
random_stuff.push_back(static_cast<double>(rand()) / RAND_MAX);
}
test.push_back(random_stuff);
}
std::vector<std::vector<double> >::iterator it=test.begin(), end=test.end();
while (it!=end)
{
std::vector<double>::iterator it1=it->begin(),end1=it->end();
std::copy(it1,end1,std::ostream_iterator<double>(std::cout, " "));
std::cout << std::endl;
++it;
}
您不需要首先,因为您的向量不包含对,并且您不需要基于 it1 和 end1 进行循环,因为它们表示您传递要复制的范围。
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