diff --git a/.gitignore b/.gitignore
index 1fadaf3..55f29f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,7 @@
 compile_commands.json
 .clang-format
 .clang-tidy
-.ccls-cache/*
+.ccls-cache/
 .cache/
 experiment/
 build/
diff --git a/include/ss/common.hpp b/include/ss/common.hpp
index ab6eb59..61b0983 100644
--- a/include/ss/common.hpp
+++ b/include/ss/common.hpp
@@ -21,13 +21,13 @@ constexpr inline auto default_delimiter = ",";
 constexpr inline auto get_line_initial_buffer_size = 128;
 
 template <bool StringError>
-inline void assert_string_error_defined() {
+void assert_string_error_defined() {
     static_assert(StringError,
                   "'string_error' needs to be enabled to use 'error_msg'");
 }
 
 template <bool ThrowOnError>
-inline void assert_throw_on_error_not_defined() {
+void assert_throw_on_error_not_defined() {
     static_assert(!ThrowOnError, "cannot handle errors manually if "
                                  "'throw_on_error' is enabled");
 }
diff --git a/include/ss/extract.hpp b/include/ss/extract.hpp
index 682e494..3c2f82e 100644
--- a/include/ss/extract.hpp
+++ b/include/ss/extract.hpp
@@ -14,6 +14,7 @@
 #else
 #include <algorithm>
 #include <cstdlib>
+#include <array>
 #endif
 
 namespace ss {
@@ -45,16 +46,17 @@ std::enable_if_t<std::is_floating_point_v<T>, std::optional<T>> to_num(
                   "Conversion to long double is disabled");
 
     constexpr static auto buff_max = 64;
-    char short_buff[buff_max];
+    std::array<char, buff_max> short_buff;
+
     size_t string_range = std::distance(begin, end);
     std::string long_buff;
 
-    char* buff;
+    char* buff = nullptr;
     if (string_range > buff_max) {
         long_buff = std::string{begin, end};
         buff = long_buff.data();
     } else {
-        buff = short_buff;
+        buff = short_buff.data();
         buff[string_range] = '\0';
         std::copy_n(begin, string_range, buff);
     }
diff --git a/include/ss/parser.hpp b/include/ss/parser.hpp
index 2cce8cb..5fbf647 100644
--- a/include/ss/parser.hpp
+++ b/include/ss/parser.hpp
@@ -32,8 +32,7 @@ class parser {
     constexpr static bool ignore_empty = setup<Options...>::ignore_empty;
 
 public:
-    parser(std::string file_name,
-           std::string delim = ss::default_delimiter)
+    parser(std::string file_name, std::string delim = ss::default_delimiter)
         : file_name_{std::move(file_name)}, reader_{file_name_, delim} {
         if (reader_.file_) {
             read_line();
@@ -449,7 +448,8 @@ private:
             using Ret = decltype(try_invoke_impl(arg, std::forward<Fun>(fun)));
             constexpr bool returns_void = std::is_same_v<Ret, void>;
             if constexpr (!returns_void) {
-                if (!try_invoke_impl(std::forward<Arg>(arg), std::forward<Fun>(fun))) {
+                if (!try_invoke_impl(std::forward<Arg>(arg),
+                                     std::forward<Fun>(fun))) {
                     handle_error_failed_check();
                 }
             } else {
@@ -681,7 +681,8 @@ private:
 
     struct reader {
         reader(const std::string& file_name_, std::string delim)
-            : delim_{std::move(delim)}, file_{std::fopen(file_name_.c_str(), "rb")} {
+            : delim_{std::move(delim)},
+              file_{std::fopen(file_name_.c_str(), "rb")} {
         }
 
         reader(const char* const buffer, size_t csv_data_size,
diff --git a/ssp.hpp b/ssp.hpp
index 85371ba..6ec769e 100644
--- a/ssp.hpp
+++ b/ssp.hpp
@@ -637,13 +637,13 @@ constexpr inline auto default_delimiter = ",";
 constexpr inline auto get_line_initial_buffer_size = 128;
 
 template <bool StringError>
-inline void assert_string_error_defined() {
+void assert_string_error_defined() {
     static_assert(StringError,
                   "'string_error' needs to be enabled to use 'error_msg'");
 }
 
 template <bool ThrowOnError>
-inline void assert_throw_on_error_not_defined() {
+void assert_throw_on_error_not_defined() {
     static_assert(!ThrowOnError, "cannot handle errors manually if "
                                  "'throw_on_error' is enabled");
 }
@@ -1562,16 +1562,17 @@ std::enable_if_t<std::is_floating_point_v<T>, std::optional<T>> to_num(
                   "Conversion to long double is disabled");
 
     constexpr static auto buff_max = 64;
-    char short_buff[buff_max];
+    std::array<char, buff_max> short_buff;
+
     size_t string_range = std::distance(begin, end);
     std::string long_buff;
 
-    char* buff;
+    char* buff = nullptr;
     if (string_range > buff_max) {
         long_buff = std::string{begin, end};
         buff = long_buff.data();
     } else {
-        buff = short_buff;
+        buff = short_buff.data();
         buff[string_range] = '\0';
         std::copy_n(begin, string_range, buff);
     }
@@ -2280,8 +2281,7 @@ class parser {
     constexpr static bool ignore_empty = setup<Options...>::ignore_empty;
 
 public:
-    parser(std::string file_name,
-           std::string delim = ss::default_delimiter)
+    parser(std::string file_name, std::string delim = ss::default_delimiter)
         : file_name_{std::move(file_name)}, reader_{file_name_, delim} {
         if (reader_.file_) {
             read_line();
@@ -2697,7 +2697,8 @@ private:
             using Ret = decltype(try_invoke_impl(arg, std::forward<Fun>(fun)));
             constexpr bool returns_void = std::is_same_v<Ret, void>;
             if constexpr (!returns_void) {
-                if (!try_invoke_impl(std::forward<Arg>(arg), std::forward<Fun>(fun))) {
+                if (!try_invoke_impl(std::forward<Arg>(arg),
+                                     std::forward<Fun>(fun))) {
                     handle_error_failed_check();
                 }
             } else {
@@ -2929,7 +2930,8 @@ private:
 
     struct reader {
         reader(const std::string& file_name_, std::string delim)
-            : delim_{std::move(delim)}, file_{std::fopen(file_name_.c_str(), "rb")} {
+            : delim_{std::move(delim)},
+              file_{std::fopen(file_name_.c_str(), "rb")} {
         }
 
         reader(const char* const buffer, size_t csv_data_size,
diff --git a/test/test_single_header.sh b/test/test_single_header.sh
index 8a2bb91..bd47386 100755
--- a/test/test_single_header.sh
+++ b/test/test_single_header.sh
@@ -3,12 +3,14 @@
 set -x
 set -e
 
-python3 script/single_header_generator.py > ssp.cpp
+TMP_HDR=test_single_header.hpp
+TMP_SRC=test_single_header.cpp
+TMP_BIN=test_single_header
 
-echo 'int main(){ ss::parser p{""}; p.get_next<int, float>(); return 0; }' \
-    >> ssp.cpp
+python3 script/single_header_generator.py > ${TMP_HDR}
+cat ${TMP_HDR} test/test_single_header_main.txt > ${TMP_SRC}
 
-g++ -std=c++17 ssp.cpp -o ssp.bin -Wall -Wextra
-./ssp.bin
+g++ -std=c++17 ${TMP_SRC} -o ${TMP_BIN} -Wall -Wextra
+./${TMP_BIN}
 
-rm ssp.cpp ssp.bin
+rm ${TMP_HDR} ${TMP_SRC} ${TMP_BIN}
diff --git a/test/test_single_header_main.txt b/test/test_single_header_main.txt
new file mode 100644
index 0000000..77d8c6c
--- /dev/null
+++ b/test/test_single_header_main.txt
@@ -0,0 +1,12 @@
+int main() {
+    using quote = ss::quote<'"'>;
+    using escape = ss::escape<'\\'>;
+    using trim = ss::trim<' '>;
+
+    std::string data = "1,string,2.34,c";
+
+    ss::parser<quote, escape, trim, ss::multiline> p{data.c_str(), data.size()};
+    auto tup = p.get_next<int, std::string, float, std::optional<char>>();
+
+    return 0;
+}