Problems using std::span<char>

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C++20

I'm trying to use std::span<char> to use both legacy C arrays and std::strings. Problem is that I can't "clear" spans correctly. Am I missing something?

What I have tried:

Consider the following code:

<pre>
void ClearSpan(std::span<char> strText)
{
	strText[0] = '\0';		// does not work with std::string
}


void main()
{
	char		cBuffer[100] = "Test";
	std::string	strBuffer("Test");

	strBuffer.reserve(100);	// size = 4, capacity = 103

	ClearSpan(cBuffer);
	ClearSpan(strBuffer);

	::strcat_s(cBuffer, _countof(cBuffer), "Test2");
	strBuffer += "Test 2";
}

I have 2 issues when using std::string:

1.) The size of strBuffer that is passed to the function is its string length, not its capacity (4 vs 103).

2.) Setting the first char to '\0' will not reset the size, so appending strings will not work correctly.