Reintroduce C++ support and add usage tests for C++ (#4)

Reviewed-on: #4
Co-authored-by: Abdelrahman <said.abdelrahman89@gmail.com>
Co-committed-by: Abdelrahman <said.abdelrahman89@gmail.com>

src/primitives/strings/str8/str8.h

@@ -4,12 +4,17 @@
 #define STR8_H
 
 #include "../../../common/aliases/aliases.h"
+#include "../../../common/assert/assert.h"
 #include "../../../common/platform/platform.h"
 #include "../../../primitives/dbl_list/dbl_list.h"
 #include "../../mem_allocator/mem_allocator.h"
 #include <string.h>
 #include <stdbool.h>
 
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 typedef struct str8 Str8;
 struct str8 {
   u64 capacity;
@@ -28,6 +33,25 @@ typedef const Str8 Str8RO;
 /**
  * Str8 stack buffers
  */
+
+#ifdef WAPP_PLATFORM_CPP
+// Uses a lambda to achieve the same behaviour achieved by the C macro
+#define wapp_str8_buf(CAPACITY) ([&](){ \
+  persistent c8 buf[CAPACITY] = {};     \
+  memset(buf, 0, CAPACITY);             \
+  return Str8{CAPACITY, 0, buf};        \
+}())
+
+// Uses a lambda to achieve the same behaviour achieved by the C macro
+#define wapp_str8_lit(STRING) ([&]() {                            \
+  persistent c8 buf[sizeof(STRING) * 2] = {};                     \
+  memcpy(buf, STRING, sizeof(STRING));                            \
+  return Str8{(sizeof(STRING) - 1) * 2, sizeof(STRING) - 1, buf}; \
+}())
+
+#define wapp_str8_lit_ro(STRING) Str8RO{sizeof(STRING) - 1, sizeof(STRING) - 1, (c8 *)STRING}
+#define wapp_str8_lit_ro_initialiser_list(STRING) {sizeof(STRING) - 1, sizeof(STRING) - 1, (c8 *)STRING}
+#else
 #define wapp_str8_buf(CAPACITY) ((Str8){.capacity = CAPACITY, .size = 0, .buf = (c8[CAPACITY]){0}})
 
 // Utilises the fact that memcpy returns pointer to dest buffer and that getting
@@ -44,11 +68,13 @@ typedef const Str8 Str8RO;
 #define wapp_str8_lit_ro_initialiser_list(STRING) {.capacity = sizeof(STRING) - 1, \
                                                    .size     = sizeof(STRING) - 1, \
                                                    .buf      = (c8 *)STRING}
+#endif // !WAPP_PLATFORM_CPP
 
 /**
  * Str8 allocated buffers
  */
 Str8 *wapp_str8_alloc_buf(const Allocator *allocator, u64 capacity);
+Str8 *wapp_str8_alloc_and_fill_buf(const Allocator *allocator, u64 capacity);
 Str8 *wapp_str8_alloc_cstr(const Allocator *allocator, const char *str);
 Str8 *wapp_str8_alloc_str8(const Allocator *allocator, Str8RO *str);
 Str8 *wapp_str8_alloc_substr(const Allocator *allocator, Str8RO *str, u64 start, u64 end);
@@ -90,8 +116,23 @@ Str8     *wapp_str8_join(const Allocator *allocator, const Str8List *list, Str8R
 /**
  * Str8 list utilities
  */
+#ifdef WAPP_PLATFORM_CPP
+#define wapp_str8_node_from_cstr(STRING) wapp_str8_list_node([&]() { \
+  persistent Str8 str = wapp_str8_lit(STRING);                      \
+  return &str;                                                      \
+}())
+#define wapp_str8_node_from_str8(STRING) wapp_str8_list_node([&]() { \
+  persistent Str8 str = STRING;                                     \
+  return &str;                                                      \
+}())
+#else
 #define wapp_str8_node_from_cstr(STRING) wapp_str8_list_node(&wapp_str8_lit(STRING))
 #define wapp_str8_node_from_str8(STRING) wapp_str8_list_node(&(STRING))
+#endif // !WAPP_PLATFORM_CPP
 u64 wapp_str8_list_total_size(const Str8List *list);
 
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
 #endif // !STR8_H