大约有 16,000 项符合查询结果（耗时：0.0291秒） [XML]
How to find nth occurrence of character in a string?
...gUtils.ordinalIndexOf, otherwise, here's an implementation:
public static int ordinalIndexOf(String str, String substr, int n) {
int pos = str.indexOf(substr);
while (--n > 0 && pos != -1)
pos = str.indexOf(substr, pos + 1);
return pos;
}
This post has been rewrit...
Is it possible to declare two variables of different types in a for loop?
...b"}}; i < N; ++i, f += 1.5) {
// ...
}
The above will give you:
int i set to 1
double f set to 1.0
std::string s set to "ab"
Make sure to #include <tuple> for this kind of declaration.
You can specify the exact types inside the tuple by typing them all out as I have with the std:...
Reset C int array to zero : the fastest way?
Assuming that we have a T myarray[100] with T = int, unsigned int, long long int or unsigned long long int, what is the fastest way to reset all its content to zero (not only for initialization but to reset the content several times in my program)? Maybe with memset?
...
Set every cell in matrix to 0 if that row or column contains a 0
...res in the end. Maybe my 2nd pass can be made more efficient...
import pprint
m = [[1, 0, 1, 1, 0],
[0, 1, 1, 1, 0],
[1, 1, 1, 1, 1],
[1, 0, 1, 1, 1],
[1, 1, 1, 1, 1]]
N = len(m)
### pass 1
# 1 rst line/column
c = 1
for i in range(N):
c &= m[i][0]
l = 1
for i in r...
SparseArray vs HashMap
I can think of several reasons why HashMap s with integer keys are much better than SparseArray s:
7 Answers
...
Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
...类提供了访问I/O的功能.我们首先在main函数中声明它.
int main()
{
boost::asio::io_service io;
下一步我们声明boost::asio::deadline_timer对象.这个asio的核心类提供I/O的功能(这里更确切的说是定时功能),总是把一个io_service对象作为他的...
How does the main() method work in C?
.... If it's a platform-specific three-argument variant with an environment pointer (a common extension), that will work too: it will find that third argument as the third element from the top of the stack.
And so a fixed call works for all cases, allowing a single, fixed start-up module to be linked ...
std::enable_if to conditionally compile a member function
...stitution.
I thought of that too and tried to use std::is_same< T, int >::value and ! std::is_same< T, int >::value which gives the same result.
That's because when the class template is instantiated (which happens when you create an object of type Y<int> among other cases),...
STL中map容器使用自定义key类型报错详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...码定义一个结构体来试试：[cpp]view plaincopystructa{char*pName;intm_a;} 引言
STL的map容器中，key的类型是不是随意的呢？
实践
编写测试代码
定义一个结构体来试试：
struct a
{
char* pName;
int m_a;
};
...
map<a, int> mp;
...
Inner class within Interface
Is it possible to create an inner class within an interface?
If it is possible why would we want to create an inner class like that since
we are not going to create any interface objects?
...