Method reserve

Sming/Wiring/WString.cpp:157–198

}

bool String::reserve(size_t size)
{
	// Can we use SSO here to avoid allocation?
	if(size <= SSO_CAPACITY) {
		// If already using SSO then no further action required
		if(sso.set) {
			return true;
		}

		// If heap hasn't been used yet then switch to SSO mode
		if(ptr.buffer == nullptr) {
			sso.set = true;
		} else {
			// Otherwise continue with existing heap allocation
			assert(ptr.capacity >= size);
		}

		return true;
	}

	// Reallocation required?
	if(!sso.set && ptr.buffer != nullptr && ptr.capacity >= size) {
		return true; // Nope :-)
	}

	// Need to handle resizing an existing heap buffer and moving from SSO to heap
	char* newbuffer = (char*)realloc(sso.set ? nullptr : ptr.buffer, size + 1);
	if(newbuffer == nullptr) {
		// allocation failed - leave existing buffer arrangement unchanged
		return false;
	}

	if(sso.set) {
		// Move content out of SSO
		memcpy(newbuffer, sso.buffer, sso.len);
		ptr.len = sso.len;
		sso.set = false;
	}
	ptr.buffer = newbuffer;
	ptr.capacity = size;
	return true;
}

String::Buffer String::getBuffer()
{