Home Backend Development C++ How to Handle GCC's Deprecated Conversion Warnings from String Constant to `char*`?

How to Handle GCC's Deprecated Conversion Warnings from String Constant to `char*`?

Dec 05, 2024 am 11:20 AM

How to Handle GCC's Deprecated Conversion Warnings from String Constant to `char*`?

How to Work Around Warnings About Deprecated Conversion from String Constant to 'char*'

In GCC versions prior to 4.3, one could declare a variable with a char * type and then assign it a string literal. However, GCC 4.3 and later deprecate this practice with a warning. The correct way to do this is to declare the variable as const char *, but if you have a large codebase and do not want to fix all the instances at once, there is a way to stifle the warnings.

To suppress these warnings, change the type of any functions that you pass string literals to from char * to const char *. This is the correct way to do it anyway, so if you're going to fix something, fix it right.

The reason for this deprecation is that string literals are of type const char *, and casting away the const to modify them is undefined behavior. To modify a string, you need to copy the const char * string character by character into a dynamically allocated char * string.

Here is an example of how to do this correctly:

#include <iostream>

void print(char* ch);

void print(const char* ch) {
    std::cout << ch;
}

int main() {
    print("Hello");
    return 0;
}
Copy after login

The above is the detailed content of How to Handle GCC's Deprecated Conversion Warnings from String Constant to `char*`?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot Article Tags

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What are the types of values ​​returned by c language functions? What determines the return value? What are the types of values ​​returned by c language functions? What determines the return value? Mar 03, 2025 pm 05:52 PM

What are the types of values ​​returned by c language functions? What determines the return value?

Gulc: C library built from scratch Gulc: C library built from scratch Mar 03, 2025 pm 05:46 PM

Gulc: C library built from scratch

C language function format letter case conversion steps C language function format letter case conversion steps Mar 03, 2025 pm 05:53 PM

C language function format letter case conversion steps

What are the definitions and calling rules of c language functions and what are the What are the definitions and calling rules of c language functions and what are the Mar 03, 2025 pm 05:53 PM

What are the definitions and calling rules of c language functions and what are the

distinct usage and phrase sharing distinct usage and phrase sharing Mar 03, 2025 pm 05:51 PM

distinct usage and phrase sharing

Where is the return value of the c language function stored in memory? Where is the return value of the c language function stored in memory? Mar 03, 2025 pm 05:51 PM

Where is the return value of the c language function stored in memory?

How does the C   Standard Template Library (STL) work? How does the C Standard Template Library (STL) work? Mar 12, 2025 pm 04:50 PM

How does the C Standard Template Library (STL) work?

How do I use algorithms from the STL (sort, find, transform, etc.) efficiently? How do I use algorithms from the STL (sort, find, transform, etc.) efficiently? Mar 12, 2025 pm 04:52 PM

How do I use algorithms from the STL (sort, find, transform, etc.) efficiently?

See all articles