Array to string conversion

I have a struct: struct T ; Next I have a string which contains values (a, b, c) for objects of type T with char "|" as a separator, for example: 1 2 3 | 3 1 2 | 2 2 1 I would like to convert that string to array of objects T. I know how to implement such conversion using C++03 but maybe C++17 has some features which maybe helpful. How would you implement it using C++17 ? I am not sure if c++17 brings here something which would make parsing easier for this. std::getline and std::stringstream are pre-modern features. We can use nodiscard to tell the compiler that the return value should be used. [[nodiscard]] std::vector parseDataToArray(const std::string& input) convertStringToArray("1 2 3 | 3 1 2 | 2 2 1"); // gives warning auto list = convertStringToArray("1 2 3 | 3 1 2 | 2 2 1"); // is OK We can consider std::string_view instead of const reference to std::string. Thanks for contributing an answer to Stack Overflow! • Please be sure to answer the question. Provide details and share your research! But avoid … • Asking for help, clarification, or responding to other answers. • Making statements based on opinion; back them up with references or personal experience. To learn more, see our

This is a short PHP guide on how to fix the “Array to string conversion” error. This is a common notice that appears whenever you attempt to treat an array like a string. Reproducing the error. To reproduce this error, you can run the following code: //Simple PHP array. $array = array(1, 2, 3); //Attempt to print the array. echo $array; The code above will result in the following error: Notice: Array to string conversion in C:\wamp\www\test\index.php on line 7 On the page, you will also see that the word “Array” has been printed out. This error occurred because I attempted to print out the array using the echo statement. The echo statement can be used to output strings or scalar values. However, in the example above, we made the mistake of trying to ‘echo out’ an array variable. To fix this particular error, we would need to loop through the array like so: //Simple PHP array. $array = array(1, 2, 3); //Loop through the elements. foreach($array as $value) In the code above, we used the PHP function is_array to check whether the current element is an array or not. We could also use a Debugging arrays. If this error occurred before you were trying to see what is inside a particular array, then you can use the print_r function instead: echo ''; print_r($array); echo ''; Alternatively, you can use the var_dump function: //var_dump the array var_dump($array); Personally, I think that using the var_dump function (combined with X-Debug) is the best approach as it provides you with...

Building or modernizing a Java enterprise web app has always been a long process, historically. Not even remotely quick. That's the main goal of Jmix is to make the process quick without losing flexibility - with the open-source RAD platform enabling fast development of business applications. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Simply put, a single Java or Kotlin developer can now quickly implement an entire modular feature, from DB schema, data model, fine-grained access control, business logic, BPM, all the way to the UI. Jmix supports both developer experiences – visual tools and coding, and a host of super useful plugins as well: >> Try out Jmix Slow MySQL query performance is all too common. Of course it is. A good way to go is, naturally, a dedicated profiler that actually understands the ins and outs of MySQL. The Jet Profiler was built for MySQL only, so it can do things like real-time query performance, focus on most used tables or most frequent queries, quickly identify performance issues and basically help you optimize your queries. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Basically, you install the desktop application, connect to your MySQL server, hit the record button, and you'll hav...

In PHP, the implode() function is a built-in function that takes an array and converts it to a string. implode() doesn’t modify the original array. It doesn’t matter whether the array is an indexed or associative array. Once you pass in the array to implode(), it joins all the values to a string. PHP implode() Syntax implode() takes in two values as parameters – the separator and the array you want to convert to a string. The separator could be any character or an empty string. It is valid as long as you specify it in quotes. If you don’t pass in the separator, implode() still works. The array on the other hand could be an associative array or an indexed array. NB: implode() doesn’t work with nested arrays. The full syntax of an implode() looks like this: implode(" ", $array); In the syntax above, an empty space (" ") is the separator, and $array is the array. Examples of Implode with an Indexed Array In PHP, an indexed array is what it sounds like – each value in the array has an index automatically assigned to it. You can also assign the indexes if you want. Below is an example of how implode() works with an indexed array: Note that I did not pass in a separator and implode() still works fine. In the example below, I passed in an empty space, comma, and hyphen as separators: ".""; echo $newLangsComma."".""; echo $newLangsHyphen .""; ?> You can see it’s better to specify a separator so you can see the values well. Examples of Implode with an Associative Array You define ...

Array to string conversion in PHP While working with PHP, we face many problems related to arrays, where we cannot work on the array directly. To solve it, first we have to convert an array into a string, and then we can efficiently work on a single element. A string is used to store characters in a sequence and represent it as a single entity with a single data type. Thus, data storage is flexible, making it easy to work with, whereas Array stores data as a particular entity, and the data storage is fixed. We will be working on three ways to convert array elements into strings in PHP. 1) Implode () function in PHP: The IMPLODE () function is a built-in PHP function that is mainly used to join all the elements of a declared array. When all the array elements are joined together, they form a string, implode () works similarly to the joint () function in PHP, and return the value as a string. NOTE: - The array is represented in the form of a string, but the base data type remains array. If we use the gettype () function on the converted string, it will still show an array. Syntax -> implode (separator, array) Here the separator refers to what we have to add between elements of an array while converting it to a string. The default value is an empty string "", but we can add many different values like " ," "-" " _" "+" ";" ":" etc. Array stands for the array that will be joined as a string. Example: To convert an array to string. "; echo " converted array " . " "; // Convert...

Description: Returns a string representation of the contents of the specified array. The string representation consists of a list of the array’s elements, enclosed in square brackets (“[]”). Adjacent elements are separated by the characters “, ” (a comma followed by a space). Returns “null” if a is null. In case of an Object Array, if the array contains other arrays as elements, they are converted to strings by the Object.toString() method inherited from Object, which describes their identities rather than their contents. Variants: • public static String toString(boolean[] arr) • public static String toString(byte[] arr) • public static String toString(char[] arr) • public static String toString(double[] arr) • public static String toString(float[] arr) • public static String toString(int[] arr) • public static String toString(long[] arr) • public static String toString(Object[] arr) • public static String toString(short[] arr) Parameters: arr – the array whose string representation to return Returns: the string representation of arr Output [111 bbbb london, 131 aaaa nyc, 121 cccc jaipur] Why does Object.toString() not work for Arrays? Using the toString() method on Arrays might not work. It considers an array as a typical object and returns default string, i.e., a ‘[‘ representing an array, followed by a character representing the primitive data type of array followed by an Identity Hex Code [See This article is contributed by Shikhar Goel. If you like GeeksforGeeks and w...

Formats a string to match examples. In this article Syntax Convert-String [-Example ] -InputObject [] Description The cmdlet formats a string to match the format of examples. Examples Example 1: Convert format of a string "Mu Han", "Jim Hance", "David Ahs", "Kim Akers" | Convert-String -Example "Ed Wilson=Wilson, E." Han, M. Hance, J. Ahs, D. Akers, K. The first command creates an array that contains first and last names. The second command formats the names according to the example. It puts the surname first in the output, followed by an initial. Example 2: Simplify format of a string $composers = @("Johann Sebastian Bach", "Wolfgang Amadeus Mozart", "Frederic Francois Chopin", "Johannes Brahms") $composers | Convert-String -Example "first middle last=last, first" Bach, Johann Mozart, Wolfgang Chopin, Frederic Brahms, Johannes The first command creates an array that contains first, middle and last names. Note that the last entry has no middle name. The second command formats the names according to the example. It puts the last name first in the output, followed by the first name. All middle names removed; entry without middle name is handled correctly. Example 3: Output management when strings don't match example $composers = @("Johann Sebastian Bach", "Wolfgang Amadeus Mozart", "Frederic Francois Chopin", "Johannes Brahms") $composers | Convert-String -Example "first middle last=middle, first" Sebastian, Johann Amadeus, Wolfgang Francois, Frederic The first command crea...

I have a struct: struct T ; Next I have a string which contains values (a, b, c) for objects of type T with char "|" as a separator, for example: 1 2 3 | 3 1 2 | 2 2 1 I would like to convert that string to array of objects T. I know how to implement such conversion using C++03 but maybe C++17 has some features which maybe helpful. How would you implement it using C++17 ? I am not sure if c++17 brings here something which would make parsing easier for this. std::getline and std::stringstream are pre-modern features. We can use nodiscard to tell the compiler that the return value should be used. [[nodiscard]] std::vector parseDataToArray(const std::string& input) convertStringToArray("1 2 3 | 3 1 2 | 2 2 1"); // gives warning auto list = convertStringToArray("1 2 3 | 3 1 2 | 2 2 1"); // is OK We can consider std::string_view instead of const reference to std::string. Thanks for contributing an answer to Stack Overflow! • Please be sure to answer the question. Provide details and share your research! But avoid … • Asking for help, clarification, or responding to other answers. • Making statements based on opinion; back them up with references or personal experience. To learn more, see our

Building or modernizing a Java enterprise web app has always been a long process, historically. Not even remotely quick. That's the main goal of Jmix is to make the process quick without losing flexibility - with the open-source RAD platform enabling fast development of business applications. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Simply put, a single Java or Kotlin developer can now quickly implement an entire modular feature, from DB schema, data model, fine-grained access control, business logic, BPM, all the way to the UI. Jmix supports both developer experiences – visual tools and coding, and a host of super useful plugins as well: >> Try out Jmix Slow MySQL query performance is all too common. Of course it is. A good way to go is, naturally, a dedicated profiler that actually understands the ins and outs of MySQL. The Jet Profiler was built for MySQL only, so it can do things like real-time query performance, focus on most used tables or most frequent queries, quickly identify performance issues and basically help you optimize your queries. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Basically, you install the desktop application, connect to your MySQL server, hit the record button, and you'll hav...

Formats a string to match examples. In this article Syntax Convert-String [-Example ] -InputObject [] Description The cmdlet formats a string to match the format of examples. Examples Example 1: Convert format of a string "Mu Han", "Jim Hance", "David Ahs", "Kim Akers" | Convert-String -Example "Ed Wilson=Wilson, E." Han, M. Hance, J. Ahs, D. Akers, K. The first command creates an array that contains first and last names. The second command formats the names according to the example. It puts the surname first in the output, followed by an initial. Example 2: Simplify format of a string $composers = @("Johann Sebastian Bach", "Wolfgang Amadeus Mozart", "Frederic Francois Chopin", "Johannes Brahms") $composers | Convert-String -Example "first middle last=last, first" Bach, Johann Mozart, Wolfgang Chopin, Frederic Brahms, Johannes The first command creates an array that contains first, middle and last names. Note that the last entry has no middle name. The second command formats the names according to the example. It puts the last name first in the output, followed by the first name. All middle names removed; entry without middle name is handled correctly. Example 3: Output management when strings don't match example $composers = @("Johann Sebastian Bach", "Wolfgang Amadeus Mozart", "Frederic Francois Chopin", "Johannes Brahms") $composers | Convert-String -Example "first middle last=middle, first" Sebastian, Johann Amadeus, Wolfgang Francois, Frederic The first command crea...