Issue with recursive function arguments

Question

I'm writing a simple recursive function, but I'm having issues calling it because of the arguments types. I'm new to C++ and typed languages, so it may be a really simple fix I don't understand.

The error:

error: no matching function for call to 'find(char*&, char* [4], const unsigned int&)'
    find(charset, word, length);
                              ^

The function definition:

void find(char * charset, char * word, const unsigned int len_) {};

The function call:

const unsigned int length = 4;
char * charset = genCharset(33, 94);
char * word[length];
find(charset, word, length);

Hope someone can point out the problem and provide an answer.

Fantastic Mr Fox · Accepted Answer · 2021-04-20 06:13:44Z

1

char * word[length]; is an array of char * aka:

[char* 1, char * 2, char* 3, ...]

Your function is expecting just a char*. Since it seems you are expecting a character set, you probably just want char charset[4], or better yet std::vector<char> or std::array<char>.

edited Apr 20, 2021 at 6:13

answered Apr 20, 2021 at 4:38

Fantastic Mr Fox

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2 Comments

Antonin GAVREL Over a year ago

Why would vector<char> be better than char array? Most of the type it is to use it as a buffer, so array will have better performance.

Fantastic Mr Fox Over a year ago

@AntoninGAVREL, sure, then use std::array, don't use char buffers

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