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了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
...过多种方式进行初始化，最常见的方式是使用 char* 或std::string 进行初始化，如清单 2 中所示。
清单 2. 创建 Boost path 对象的方法
path(); // empty path
path(const char* pathname);
path(const std::string& pathname);
path(const char* pathname, boost::f...
Should operator
...ostream>
class Paragraph
{
public:
explicit Paragraph(std::string const& init)
:m_para(init)
{}
std::string const& to_str() const
{
return m_para;
}
bool operator==(Paragraph const& rhs) const
{
...
Is there a way to check if a file is in use?
... || errorCode == ERROR_LOCK_VIOLATION;
}
internal static bool CanReadFile(string filePath)
{
//Try-Catch so we dont crash the program and can check the exception
try {
//The "using" is important because FileStream implements IDisposable and
//"using" will avoid a heap exhaus...
Convert from ASCII string encoded in Hex to plain ASCII?
...61756c", "hex") works for Python 2 and Python 3. But it returns a bytes() string in Python 3. But that's reasonable for an ASCII string.
– Mark Evans
Aug 7 '15 at 8:46
...
How is std::function implemented?
...;
}
};
// examples
int main()
{
int i = 0;
auto fn = [i](std::string const& s) mutable
{
std::cout << ++i << ". " << s << std::endl;
};
fn("first"); // 1. first
fn("second"); ...
What is std::string::c_str() lifetime?
...
The c_str() result becomes invalid if the std::string is destroyed or if a non-const member function of the string is called. So, usually you will want to make a copy of it if you need to keep it around.
In the case of your example, it appears that the results of c_str(...
How can I safely encode a string in Java to use as a filename?
I'm receiving a string from an external process. I want to use that String to make a filename, and then write to that file. Here's my code snippet to do this:
...
How to get the instance id from within an ec2 instance?
... with the digits only. (Backslash + parentheses tell sed to remember a substring, which is recalled with \1.) I found this a little easier to read--the only backslashes are those required by sed: EC2_REGION="$(echo "$EC2_AVAIL_ZONE" | sed -e 's:\([0-9][0-9]*\)[a-z]*$:\1:')".
–...
How can we match a^n b^n with Java regex?
...'s start with a simpler problem: we want to match a+ at the beginning of a string, but only if it's followed immediately by b+. We can use ^ to anchor our match, and since we only want to match the a+ without the b+, we can use lookahead assertion (?=…).
Here is our pattern with a simple test harn...
VC/Linux C++ 递归访问目录下所有文件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
#include <dirent.h>
#include <iostream>
#include <cstdlib>
#include <cstring>
using namespace std;
void GetFileInDir(string dirName)
{
DIR* Dir = NULL;
struct dirent* file = NULL;
if (dirName[dirName.size()-1] != '/')
{
dirName += "/";
}
if ((Dir = open...