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What is std::string::c_str() lifetime?
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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(...
Unix's 'ls' sort by name
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Files being different only by a numerical string can be sorted on this number at the condition that it is preceded by a separator.
In this case, the following syntax can be used:
ls -x1 file | sort -t'<char>' -n -k2
Example:
ls -1 TRA*log | sort -t'_' -n -...
Why historically do people use 255 not 256 for database field magnitudes?
...char data (unless constrained otherwise). Most systems treat such an empty string as distinct from NULL, but some systems (notably Oracle) treat an empty string identically to NULL. For systems where an empty string is not NULL, an additional bit somewhere in the row would be needed to indicate whet...
How do I find out if first character of a string is a number?
In Java is there a way to find out if first character of a string is a number?
5 Answers
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Getter and Setter declaration in .NET [duplicate]
...es are used to encapsulate some data. You could use a plain field:
public string MyField
But this field can be accessed by all outside users of your class. People can insert illegal values or change the value in ways you didn't expect.
By using a property, you can encapsulate the way your data i...
When should I use perror(“…”) and fprintf(stderr, “…”)?
... to perror(NULL) since a call to strerror(errno) will generate the printed string value for errno, and you can then combined that with any other custom error message via fprintf.
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How to print without newline or space?
... parameters of the print function:
To not add a newline to the end of the string:
print('.', end='')
To not add a space between all the function arguments you want to print:
print('a', 'b', 'c', sep='')
You can pass any string to either parameter, and you can use both parameters at the same t...
How to list files in a directory in a C program?
...aybe I can use exec function to run find command but I want file name as a string to send client program. How can I do this?
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In-memory size of a Python structure
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@AlexMartelli Hi Alex! .. Why minimum size of a char in python is 25 bytes. >>> getsizeof('a') gives 25 and >>> getsizeof('ab') gives 26 `
– Grijesh Chauhan
Jan 17 '13 at 5:13
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Pass complex parameters to [Theory]
...s.
See i.e. these examples from here:
PropertyData Example
public class StringTests2
{
[Theory, PropertyData(nameof(SplitCountData))]
public void SplitCount(string input, int expectedCount)
{
var actualCount = input.Split(' ').Count();
Assert.Equal(expectedCount, actua...