support bazel complie this project and format code.

learn_class/modern_cpp_30/literalAssert/literal.cpp

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+//
+// Created by light on 19-12-25.
+//
+
+#include <chrono>
+
+#include <bitset>
+#include <complex>
+#include <iostream>
+#include <string>
+#include <thread>
+
+using namespace std::literals::chrono_literals;
+using namespace std::literals::string_literals;
+using namespace std::literals::complex_literals;
+
+struct length {
+  double value;
+  enum unit {
+    metre,
+    kilometre,
+    millimetre,
+    centimetre,
+    inch,
+    foot,
+    yard,
+    mile,
+  };
+  static constexpr double factors[] = {1.0,    1000.0, 1e-3,   1e-2,
+                                       0.0254, 0.3048, 0.9144, 1609.344};
+
+  explicit length(double v, unit u = metre) { value = v * factors[u]; }
+};
+
+length operator+(length lhs, length rhs) {
+  return length(lhs.value + rhs.value);
+}
+
+length operator"" _m(long double v) { return length(v, length::metre); }
+
+length operator"" _cm(long double v) { return length(v, length::centimetre); }
+
+//  可能有其他运算符
+int main() {
+
+  std::cout << "i * i = " << 1i * 1i << std::endl;
+  std::cout << "Waiting for 500ms" << std::endl;
+  std::this_thread::sleep_for(500ms);
+  std::cout << "Hello world"s.substr(0, 5) << std::endl;
+
+  length l1 = length(1.0, length::metre);
+  length l2 = length(1.0, length::centimetre);
+  std::cout << l2.value << std::endl;
+  std::cout << (l1 + l2).value << std::endl;
+
+  // 1.0_m + 10.0_cm
+  std::cout << (1.0_m + 1.0_cm).value << std::endl;
+
+  // 二进制字面量
+  unsigned mask = 0b1101;
+  // 以十进制打印
+  std::cout << mask << std::endl;
+
+  // 打印二进制字面量
+  std::cout << std::bitset<4>(mask) << std::endl;
+
+  // 数字分隔符
+  unsigned mk = 0b111'000'000;
+  double pi = 3.141'5926;
+  return 0;
+}