C++ read text file to a vector of lines or a string

file-utils.cpp

#include <string>
#include <iostream>
#include <fstream>
#include <vector>

std::vector<std::string> utils::files::readLines(const std::string& filename) {

	std::ifstream ifs(filename);

	std::vector<std::string> lines;

	if (!ifs) {
		std::cerr << "Cannot open file: " << filename << std::endl;
	} else {

		for (std::string line; std::getline(ifs, line); /**/) {
			lines.push_back(line);
		}

		std::cout << std::to_string(lines.size()) << " lines read from [" << filename << "]" << std::endl;

	}

	return lines;
}

std::string utils::files::readFileToString(const std::string& file) {

	std::cout << "Read string from file [" << file << "]" << std::endl;

	std::ifstream t(file);

	std::string str((std::istreambuf_iterator<char>(t)), std::istreambuf_iterator<char>());

	return str;

}