How can I tokenize a std::string using strtok() in C ?

Tokenizing a std::string with strtok()

When working with C , it's often desirable to tokenize strings, splitting them into smaller substrings or tokens based on a delimiter. The C function strtok() is a popular option for tokenizing strings, but it requires a char* input, while std::string is the preferred string type in C . This article explores a workaround to use strtok() on a std::string.

Using an Istringstream for Tokenization

One approach is to use an istringstream object to convert the std::string into a stream of characters, which can then be tokenized by strtok(). For example:

#include <iostream>
#include <string>
#include <sstream>

int main() {
    std::string myText("some-text-to-tokenize");
    std::istringstream iss(myText);
    std::string token;

    while (std::getline(iss, token, '-')) {
        std::cout << token << std::endl;
    }

    return 0;
}

In this example, the istringstream iss is constructed from the std::string myText. The std::getline function is then used to extract tokens from the stream, using the delimiter character '-' as a separator. Each token is printed to the console using std::cout.

Alternative Approaches

Another option mentioned in the response is to use the Boost library, which provides more flexible tokenization capabilities. However, this solution requires the Boost library to be installed on the system.

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