小编Wal*_*han的帖子

我正在尝试创建一个函数,该函数在满足给定条件的范围内找到最小元素:

#include <functional>
#include <iostream>
#include <vector>

template <typename It, typename Pred, typename Comp>
It minElementWhere(
    It begin,
    It end,
    Pred pred = Pred(),

    // Use less-than as the default comparator.
    Comp comp = std::less<decltype(*std::declval<It>())>()
) {
    It minElement = end;

    for (It it = begin; it != end; ++it) {
        if (!pred(*it)) {
            continue;
        }

        if (comp(*it, *minElement)) {
            minElement = it;
        }
    }

    return minElement;
}

int main() {
    std::vector<double> foo;
    foo.push_back(6);
    foo.push_back(10);
    foo.push_back(-3);
    foo.push_back(7);

    std::cout << *minElementWhere( …

每当我尝试使用WMC for Visual Studio Ultimate with Blend在Windows 8 Professional中获取开发人员的许可时,我都会收到此错误:

我们无法获得Windows 8的开发人员许可证.(错误0xC03F1014)

如何修复此错误以获取开发人员的许可？

当虚拟评分是一个参数时,这个演示代码(取自这里:http:
TypeError: __init__() got an unexpected keyword argument 'scoring'//scikit-learn.org/dev/auto_examples/grid_search_digits.html )的可能性如何(http://scikit-learn.org/dev/modules /generated/sklearn.grid_search.GridSearchCV.html#sklearn.grid_search.GridSearchCV)？

from __future__ import print_function

from sklearn import datasets
from sklearn.cross_validation import train_test_split
from sklearn.grid_search import GridSearchCV  
from sklearn.metrics import classification_report
from sklearn.svm import SVC

print(__doc__)

# Loading the Digits dataset
digits = datasets.load_digits()

# To apply an classifier on this data, we need to flatten the image, to
# turn the data in a (samples, feature) matrix:
n_samples = len(digits.images)
X = digits.images.reshape((n_samples, -1)) …

这段代码应该打印什么？

class Parent():
    class Meta(object):
        classattr = "Hello"

class Child(Parent):
    pass


Child.Meta.classattr = "world"


ch = Child()
pr = Parent()

ch.Meta.classattr = "Oppa"

print Parent.Meta.classattr
print Child.Meta.classattr

print pr.Meta.classattr
print ch.Meta.classattr

我期待以下:

Hello
world
Hello
Oppa

但得到了

Oppa
Oppa
Oppa
Oppa

所以......我可以通过修改子类实例来修改父类(而不是实例!).这是正常的吗？

什么是>>符号是什么意思？在这个页面上,有一行如下所示:

var i = 0, l = this.length >> 0, curr;

假设我正在 Git 存储库中运行脚本并希望直接访问索引文件。如何以也尊重例如工作树的方式获取索引文件的路径？