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问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Splitting a string in C++ In PHP, the explode() function will take a string and chop it up into an array separating each element by a specified delimiter. Is there an equivalent function in C++? 回答1: Here's a simple example implementation: #include <string> #include <vector> #include <sstream> #include <utility> std::vector<std::string> explode(std::string const & s, char delim) { std::vector<std::string> result

问题 In Python, given a list, I can sort it by a key function, e.g.: >>> def get_value(k): ... print "heavy computation for", k ... return {"a": 100, "b": 30, "c": 50, "d": 0}[k] ... >>> items = ['a', 'b', 'c', 'd'] >>> items.sort(key=get_value) heavy computation for a heavy computation for b heavy computation for c heavy computation for d >>> items ['d', 'b', 'c', 'a'] As you see, the list was sorted not alphanumerically but by the return value of get_value() . Is there an equivalent in C++? std:

问题 the question is simple, there is a functional equivalent of the famous iif in java? For example: IIf (vData = "S", True, False) Thanks in advance. 回答1: vData.equals("S") ? true : false or in this particular case obviously one could just write vData.equals("S") 回答2: Yeah, the ternary op ? : vData.equals("S") ? true : false 回答3: The main difference between the Java ternary operator and IIf is that IIf evaluates both the returned value and the unreturned value, while the ternary operator short

问题 the question is simple, there is a functional equivalent of the famous iif in java? For example: IIf (vData = "S", True, False) Thanks in advance. 回答1: vData.equals("S") ? true : false or in this particular case obviously one could just write vData.equals("S") 回答2: Yeah, the ternary op ? : vData.equals("S") ? true : false 回答3: The main difference between the Java ternary operator and IIf is that IIf evaluates both the returned value and the unreturned value, while the ternary operator short

问题 does anyone know how can I achieve java's Deflater.deflate() functionality in .NET so it would be understandable for java's Infalter.inflate() method? regards, Rafal 回答1: I have used #zipLib. It is pretty straight forward. Taken from their site: #ziplib (SharpZipLib, formerly NZipLib) is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET

问题 My Table collation is "utf8_general_ci". If i run a query like: SELECT * FROM mytable WHERE myfield = "FÖÖ" i get results where: ... myfield = "FÖÖ" ... myfield = "FOO" is this the default for "utf8_general_ci"? What collation should i use to only get records where myfield = "FÖÖ"? 回答1: SELECT * FROM table WHERE some_field LIKE ('%ö%' COLLATE utf8_bin) 回答2: A list of the collations offered by MySQL for Unicode character sets can be found here: http://dev.mysql.com/doc/refman/5.0/en/charset

问题 My Table collation is "utf8_general_ci". If i run a query like: SELECT * FROM mytable WHERE myfield = "FÖÖ" i get results where: ... myfield = "FÖÖ" ... myfield = "FOO" is this the default for "utf8_general_ci"? What collation should i use to only get records where myfield = "FÖÖ"? 回答1: SELECT * FROM table WHERE some_field LIKE ('%ö%' COLLATE utf8_bin) 回答2: A list of the collations offered by MySQL for Unicode character sets can be found here: http://dev.mysql.com/doc/refman/5.0/en/charset

问题 Perl RegEx and PCRE (Perl-Compatible RegEx) amongst others have the shorthand \K to discard all matches to the left of it except for capturing groups, but Java doesn't support it, so what's Java's equivalent to it ? 回答1: There is no direct equivalent . However, you can always re-write such patterns using capturing groups . If you have a closer look at \K operator and its limitations, you will see you can replace this pattern with capturing groups . See rexegg.com \K reference: In the middle

问题 I'm currently trying to learn Ruby and I'm trying to understand more about what it offers in terms of encapsulation and contracts. In C# a contract can be defined using an interface. A class which implements the interface must fulfil the terms within the contract by providing an implementation for each method and property (and maybe other things) defined. The individual class that implements an interface can do whatever it needs within the scope of the methods defined by the contract, so long

问题 I'm currently trying to learn Ruby and I'm trying to understand more about what it offers in terms of encapsulation and contracts. In C# a contract can be defined using an interface. A class which implements the interface must fulfil the terms within the contract by providing an implementation for each method and property (and maybe other things) defined. The individual class that implements an interface can do whatever it needs within the scope of the methods defined by the contract, so long