add tostr.h

Change-Id: I61db7993192e82b453427bdc68c681af7a48d49b

Author: lishuangquan

tostr.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <string>
+#include <sstream>
+#include <vector>
+
+namespace cil {
+
+template <typename T>
+std::string tostr(const T& t) {
+    std::ostringstream os;
+    os << t;
+    return os.str();
+}
+
+template <typename T>
+void push_to_str_vec(std::vector<std::string>& strs, const T& t) {
+    strs.push_back(tostr(t));
+}
+template <typename T, typename ...Args>
+void push_to_str_vec(std::vector<std::string>& strs, const T& t, const Args&... args) {
+    push_to_str_vec(strs, t);
+    push_to_str_vec(strs, args...);
+}
+
+template <typename T, typename ...Args>
+std::vector<std::string> tostrs(const T& t, const Args&... args) {
+    std::vector<std::string> strs;
+    push_to_str_vec(strs, t, args...);
+    return strs;
+};
+
+template <typename ...Args>
+std::string tostr_with_delim(const std::string& delim, const Args&... args) {
+    std::vector<std::string> strs;
+    push_to_str_vec(strs, args...);
+    std::string ret;
+    for (size_t i = 0; i < strs.size(); ++i) {
+        if (i > 0) ret += delim;
+        ret += strs[i];
+    }
+    return ret;
+};
+
+template <typename ...Args>
+std::string tostr(const Args&... args) {
+    return tostr_with_delim(" ", args...);
+};
+
+}  // namespace cil