Errors in compiling https://immediate-mode-ui.github.io/Nuklear/doc/#nuklear/example

[raphael10-collab]

In basic.cc file :

#define NK_IMPLEMENTATION
#include "../../Nuklear/nuklear.h"

// https://immediate-mode-ui.github.io/Nuklear/doc/#nuklear/example

/* init gui state */
struct nk_context ctx;
//nk_init_fixed(&ctx, calloc(1, MAX_MEMORY), MAX_MEMORY, &font);

nk_bool nk_init_default(struct nk_context *ctx, const struct nk_user_font *font);

// init gui state
enum {EASY, HARD};
static int op = EASY;
static float value = 0.6f;
static int i =  20;
//nk_init_fixed(... &ctx, calloc(1, MAX_MEMORY), MAX_MEMORY, &font);

nk_bool nk_init_default(struct nk_context *ctx, const struct nk_user_font *font);

if (nk_begin(&ctx, "Show", nk_rect(50, 50, 220, 220),
    NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_CLOSABLE)) {
    // fixed widget pixel width
    nk_layout_row_static(&ctx, 30, 80, 1);
    if (nk_button_label(&ctx, "button")) {
        // event handling
    }
    // fixed widget window ratio width
    nk_layout_row_dynamic(&ctx, 30, 2);
    if (nk_option_label(&ctx, "easy", op == EASY)) op = EASY;
    if (nk_option_label(&ctx, "hard", op == HARD)) op = HARD;
    // custom widget pixel width
    nk_layout_row_begin(&ctx, NK_STATIC, 30, 2);
    {
        nk_layout_row_push(&ctx, 50);
        nk_label(&ctx, "Volume:", NK_TEXT_LEFT);
        nk_layout_row_push(&ctx, 110);
        nk_slider_float(&ctx, 0, &value, 1.0f, 0.1f);
    }
    nk_layout_row_end(&ctx);
}
nk_end(ctx);

Compiling:

cmake --build cmakebuilddir/
[ 14%] Building CXX object CMakeFiles/basic.dir/src/basic.cc.o
/home/raphy/webview-prj/src/basic.cc:40:1: error: expected unqualified-id before ‘if’
   40 | if (nk_begin(&ctx, "Show", nk_rect(50, 50, 220, 220),
      | ^~
/home/raphy/webview-prj/src/basic.cc:61:7: error: expected constructor, destructor, or type conversion before ‘(’ token
   61 | nk_end(ctx);
      |       ^
gmake[2]: *** [CMakeFiles/basic.dir/build.make:76: CMakeFiles/basic.dir/src/basic.cc.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:87: CMakeFiles/basic.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2