feat(calc_lib): 基本的大数加法(使用 make_unique 替代 new/delete), 只实现了整数

calc_lib/src/khl_calc/khl_calc_decimal.cpp

 #include <iostream>
+#include <memory>
 #include <cstring>
 #include <sstream>
 #include <algorithm>
@@ -8,36 +9,29 @@ KHL_CALC_NAMESPACE_BEGIN
 
 std::string Decimal::add(std::string x, std::string y)
 {
+    /** 入参转换为 int 数组, 并倒置 */
     char * sx = const_cast<char *>(x.c_str());
     char * sy = const_cast<char *>(y.c_str());
 
-    std::cout << "sx:" << sx << std::endl;
-    std::cout << "sy:" << sy << std::endl;
-
     const size_t lx = strlen(sx);
     const size_t ly = strlen(sy);
 
-    int * a = new int[lx];
-    int * b = new int[ly];
+    auto a = std::make_unique<int[]>(lx);
+    auto b = std::make_unique<int[]>(ly);
 
-    std::cout << "sx > a" << std::endl;
     for (int i = 0; i < lx; i++)
     {
         a[lx - i] = sx[i] - '0';
-        std::cout << sx[i] << " " << a[lx - i] << std::endl;
     }
-    std::cout << "sx > a" << std::endl;
 
-    std::cout << "sy > b" << std::endl;
     for (int i = 0; i < ly; i++)
     {
         b[ly - i] = sy[i] - '0';
-        std::cout << sy[i] << " " << b[ly - i] << std::endl;
     }
-    std::cout << "sy > b" << std::endl;
 
+    /** 计算 */
     const size_t lc = std::max(lx, ly) + 1;
-    int * result = new int[lc];
+    auto result = std::make_unique<int[]>(lc);
 
     for (int i = 0; i < lc; i++)
     {
@@ -46,30 +40,25 @@ std::string Decimal::add(std::string x, std::string y)
         result[i] = result[i] % 10;
     }
 
+    /** 删除前导0 */
     size_t len = lc;
     if (0 == result[lc] && lc > 0)
     {
         len--;
     }
-    std::cout << "---" << std::endl;
-    char *c = new char[lc];
+
+    /** 翻转倒置的计算结果 */
+    auto c = std::make_unique<char[]>(lc);
     for (int i = len, j = 0; i > 0; i--, j++)
     {
-        std::cout << result[i] << std::endl;
         c[j] = result[i] + '0';
     }
-    std::cout << "---" << std::endl;
 
     std::string str;
     std::stringstream ss;
     ss << c;
     ss >> str;
 
-    delete[] a;
-    delete[] b;
-    delete[] result;
-    delete[] c;
-
     return str;
 }