How to Safely Convert char to wchar_t While Preserving Allocated Memory?

Preserving Memory When Converting char to wchar_t

Converting character arrays from ASCII to Unicode presents a challenge in preserving allocated memory. An attempted solution might resemble the following:

<code class="cpp">const wchar_t *GetWC(const char *c) {
    const size_t cSize = strlen(c)+1;
    wchar_t wc[cSize];
    mbstowcs(wc, c, cSize);

    return wc;
}</code>

However, this approach falls short due to the local definition of wc, which gets deallocated at the end of the function call, leading to undefined behavior.

To avoid this pitfall, a simple modification is required:

<code class="cpp">const wchar_t *GetWC(const char *c) {
    const size_t cSize = strlen(c)+1;
    wchar_t* wc = new wchar_t[cSize];
    mbstowcs(wc, c, cSize);

    return wc;
}</code>

In this adjusted code, wc is allocated dynamically using new, ensuring its persistence beyond the function call. Consequently, it becomes the responsibility of the calling code to deallocate the allocated memory to prevent memory leaks.

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