script param "constructors" to add the _Construct version of constructors issue #278

README.md

@@ -37,7 +37,7 @@ Notes:
 * you will need LuaJIT (https://github.com/LuaJIT/LuaJIT.git better 2.1 branch) or precompiled for linux/macOS/windows in https://luapower.com/luajit/download
 * you need to use also a C++ compiler for doing preprocessing: gcc (In windows MinGW-W64-builds for example), clang or cl (MSVC). (this repo was done with gcc)
 * update `imgui` folder to the version you desire.
-* edit `generator/generator.bat` on windows, or `generator/generator.sh` on linux, to choose between gcc, clang, or cl and to choose desired backends and whether imgui_internal is generated or not, Freetype2 is used or not and comments are generated or not
+* edit `generator/generator.bat` on windows, or `generator/generator.sh` on linux, to choose between gcc, clang, or cl and to choose desired backends and whether imgui_internal is generated or not, Freetype2 is used or not and comments are generated or not and if constructors are generated also with versions performing just initialization of structs provided by yourself (_Construct is added to the constructor names)
 * the defaults of generator are gcc as compiler, imgui_internal included and sdl, glfw, vulkan, opengl2 and opengl3 as backends.
 * edit config_generator.lua for adding includes needed by your chosen backends (vulkan needs that).
 * Run generator.bat or generator.sh with gcc, clang or cl and LuaJIT on your PATH.

generator/cpp2ffi.lua

@@ -2421,6 +2421,12 @@ local function func_implementation(FP)
                 table.insert(outtab,"{\n")
                 table.insert(outtab,"    return IM_NEW("..def.stname..")"..def.call_args..";\n")
                 table.insert(outtab,"}\n")
+				if FP.CONSTRUCTORS_GENERATION then
+					table.insert(outtab,"CIMGUI_API void "..def.ov_cimguiname.."_Construct("..def.stname.."* self"..(empty and "" or ","..def.args:sub(2,-2))..")\n")
+					table.insert(outtab,"{\n")
+					table.insert(outtab,"    IM_PLACEMENT_NEW(self)"..def.stname..def.call_args..";\n")
+					table.insert(outtab,"}\n")
+				end
             elseif def.destructor then
                 local args = "("..def.stname.."* self)"
                 local fname = def.stname.."_destroy" 
@@ -2491,6 +2497,9 @@ local function func_header_generate_funcs(FP)
             if def.constructor then
                 assert(def.stname ~= "","constructor without struct")
                 table.insert(outtab,"CIMGUI_API "..def.stname.."* "..def.ov_cimguiname ..(empty and "(void)" or def.args)..";"..addcoment.."\n")
+				if FP.CONSTRUCTORS_GENERATION then
+					table.insert(outtab,"CIMGUI_API void "..def.ov_cimguiname.."_Construct("..def.stname.."* self"..(empty and "" or ","..def.args:sub(2,-2))..")\n")
+				end
             elseif def.destructor then
                 table.insert(outtab,"CIMGUI_API void "..def.ov_cimguiname..def.args..";"..addcoment.."\n")
             else --not constructor

generator/generator.bat

@@ -16,6 +16,7 @@ set PATH=%PATH%;C:\anima;C:\mingws\i686-7.2.0-release-posix-dwarf-rt_v5-rev1\min
 ::process  files
 :: arg[1] compiler name gcc, clang or cl
 :: arg[2] options as words in one string: internal for imgui_internal generation, freetype for freetype generation, comments for comments generation, nochar to skip char* function version, noimstrv to skip imstrv
+:: "constructors" adds the _Construct version of constructors
 :: examples: "" "internal" "internal freetype comments"
 :: arg[3..n] name of implementations to generate and/or CFLAGS (e.g. -DIMGUI_USER_CONFIG or -DIMGUI_USE_WCHAR32)
 luajit ./generator.lua gcc "internal noimstrv" glfw opengl3 opengl2 sdl2 %*

generator/generator.lua

@@ -9,6 +9,7 @@ local COMPILER = script_args[1]
 local INTERNAL_GENERATION = script_args[2]:match("internal") and true or false
 local FREETYPE_GENERATION = script_args[2]:match("freetype") and true or false
 local COMMENTS_GENERATION = script_args[2]:match("comments") and true or false
+local CONSTRUCTORS_GENERATION = script_args[2]:match("constructors") and true or false
 local NOCHAR = script_args[2]:match("nochar") and true or false
 local NOIMSTRV = script_args[2]:match("noimstrv") and true or false
 local IMGUI_PATH = os.getenv"IMGUI_PATH" or "../imgui"
@@ -67,6 +68,7 @@ print("HAVE_COMPILER",HAVE_COMPILER)
 print("INTERNAL_GENERATION",INTERNAL_GENERATION)
 print("FREETYPE_GENERATION",FREETYPE_GENERATION)
 print("COMMENTS_GENERATION",COMMENTS_GENERATION)
+print("CONSTRUCTORS_GENERATION",CONSTRUCTORS_GENERATION)
 print("CPRE",CPRE)
 --------------------------------------------------------------------------
 --this table has the functions to be skipped in generation
@@ -321,6 +323,7 @@ local function parseImGuiHeader(header,names)
 	parser.UDTs = {"ImVec2","ImVec4","ImColor","ImRect"}
 	--parser.gen_template_typedef = gen_template_typedef --use auto
 	parser.COMMENTS_GENERATION = COMMENTS_GENERATION
+	parser.CONSTRUCTORS_GENERATION = CONSTRUCTORS_GENERATION
 	parser.NOCHAR = NOCHAR
 	parser.NOIMSTRV = NOIMSTRV
 	local defines = parser:take_lines(CPRE..header,names,COMPILER)

generator/generator.sh

@@ -14,6 +14,7 @@
 #process  files
 # arg[1] compiler name gcc, clang, or cl
 # arg[2] options as words in one string: internal for imgui_internal generation, freetype for freetype generation, comments for comments generation, nochar to skip char* function version, noimstrv to skip imstrv
+# "constructors" adds the _Construct version of constructors
 # examples: "" "internal" "internal freetype" "comments internal"
 # arg[3..n] name of implementations to generate and/or CLFLAGS (e.g. -DIMGUI_USER_CONFIG or -DIMGUI_USE_WCHAR32)
 #