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Learn How To Use Wide String Clear Methods in C++

Modern C++ uses Wide Strings and Unicode Strings to support worldwide languages. Wide Strings (std::wstring) uses wcha_tr as the character type which means they are 2-bytes chars and they are an instantiation of the basic_string class template. In C++, there are several type definitions for common character types and one of them is std::wstring types that are defined in header <string>.

wstrings are the string class for 2-bytes characters represented with wstring and alphanumeric characters are stored and displayed in wide string forms. In other terms, wstring stores for the alphanumeric text with 2-byte chars, called wchar_t. Wide Strings are the instantiation of the basic_string class template that uses wchar_t as the character type. In modern C++, simply we can define a wide string with L” ” literal as below,

Wide Strings (wstring) are a class that contains arrays of wide characters with useful methods, and we can access, or modify their characters easily. In C++, while wide string contents are defined between L” and ” with literal L, wide characters are defined between L’ and ‘ with literal L

The wstring has methods to append, assign, copy, align, replace or operate with other strings. These methods can be used in all string methods with their appropriate syntax. We can clear a wstring with clear()erase(), resize() methods. 

In this post, you’ll learn how to clear a wide string in a straightforward manner, as well as the various methods to use to clear a std::wstring, such as using the clear() method with wstrings; the resize() method to clear strings, and the erase() method to clear strings. By learning how to use wide string clear methods in c++, it will help you to easily build C++ applications using the C++ Compiler.

How to clear a Wide String with the clear() method in C++

The clear() method is a String Method that removes all characters from the string as same as setting string to “”. It doesn’t have parameter and it doesn’t return a value; After using clear() method pointers, references, and iterators related with it are invalidated.


We can simply clear characters of a string by using its clear() method as below.

Here we can clear characters of a string by using its clear() method as given full example below,

How to clear a Wide String by setting it to “” in C++

In Modern C++, Simply we can clear a string by setting it to “”, Here is an example below,

How to clear a Wide String with the resize() Method in C++

We can use resize() method to set string size. We can use 0 to clear it, here is an example below,

How to clear a Wide String with the erase() method in C++

We can clear a string by using erase() method with begin() and end() iterators as it’s parameters.

Comparing Clear Methods of Wide String in C++

We can compare all those clear methods in an example. Here we prepared a use wstr_info() function to display wstring details after each operation. We can use empty() method if the string is empty or not. Here is the full example to see each methods;


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About author

Dr. Yilmaz Yoru has 35+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He was born in 1974, Eskisehir-Turkey, started coding in college and graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. He worked as a research assistant at the same university for more than 10 years. He received his MSc and PhD degrees from the same department at the same university. Since 2012, he is the founder and CEO of Esenja LLC Company. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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