[gjs/msvc.partial.fix: 18/23] [modules]/cairo-*.cpp: Forward declare specializations

[Chun-wei Fan <fanchunwei src gnome org>]

commit feff855eaec95dbbaeea3b1b8b49cae34d8c9d08
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Mar 1 11:29:53 2021 +0800

    [modules]/cairo-*.cpp: Forward declare specializations
    
    This will help us avoid failing the static_assert in js/GCPolicyApi.h where
    pointer types are not allowed, when building with Visual Studio, which is
    caused by the compiler not picking up the needed types when js/GCPolicyAPI.h
    is included in some way or the other.

 modules/cairo-context.cpp         | 8 ++++++++
 modules/cairo-gradient.cpp        | 8 ++++++++
 modules/cairo-image-surface.cpp   | 8 ++++++++
 modules/cairo-linear-gradient.cpp | 8 ++++++++
 modules/cairo-path.cpp            | 8 ++++++++
 modules/cairo-pdf-surface.cpp     | 8 ++++++++
 modules/cairo-ps-surface.cpp      | 8 ++++++++
 modules/cairo-radial-gradient.cpp | 8 ++++++++
 modules/cairo-solid-pattern.cpp   | 8 ++++++++
 modules/cairo-surface-pattern.cpp | 8 ++++++++
 modules/cairo-svg-surface.cpp     | 8 ++++++++
 11 files changed, 88 insertions(+)
---
diff --git a/modules/cairo-context.cpp b/modules/cairo-context.cpp
index 696af554..76c94cf5 100644
--- a/modules/cairo-context.cpp
+++ b/modules/cairo-context.cpp
@@ -31,6 +31,14 @@
 #include "gjs/macros.h"
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 #define _GJS_CAIRO_CONTEXT_GET_PRIV_CR_CHECKED(cx, argc, vp, argv, obj) \
     GJS_GET_THIS(cx, argc, vp, argv, obj);                              \
     cairo_t* cr;                                                        \
diff --git a/modules/cairo-gradient.cpp b/modules/cairo-gradient.cpp
index 07c29328..bbba5af3 100644
--- a/modules/cairo-gradient.cpp
+++ b/modules/cairo-gradient.cpp
@@ -19,6 +19,14 @@
 #include "gjs/macros.h"
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 JSObject* CairoGradient::new_proto(JSContext* cx, JSProtoKey) {
     JS::RootedObject parent_proto(cx, CairoPattern::prototype(cx));
     return JS_NewObjectWithGivenProto(cx, nullptr, parent_proto);
diff --git a/modules/cairo-image-surface.cpp b/modules/cairo-image-surface.cpp
index 1ec8da4b..ecbc2553 100644
--- a/modules/cairo-image-surface.cpp
+++ b/modules/cairo-image-surface.cpp
@@ -19,6 +19,14 @@
 #include "gjs/macros.h"
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 JSObject* CairoImageSurface::new_proto(JSContext* cx, JSProtoKey) {
     JS::RootedObject parent_proto(cx, CairoSurface::prototype(cx));
     return JS_NewObjectWithGivenProto(cx, nullptr, parent_proto);
diff --git a/modules/cairo-linear-gradient.cpp b/modules/cairo-linear-gradient.cpp
index 13842396..70675a78 100644
--- a/modules/cairo-linear-gradient.cpp
+++ b/modules/cairo-linear-gradient.cpp
@@ -16,6 +16,14 @@
 #include "gjs/jsapi-util-args.h"
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 namespace JS {
 class CallArgs;
 }
diff --git a/modules/cairo-path.cpp b/modules/cairo-path.cpp
index a4a82725..cabbf8b8 100644
--- a/modules/cairo-path.cpp
+++ b/modules/cairo-path.cpp
@@ -16,6 +16,14 @@
 
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 // clang-format off
 const JSPropertySpec CairoPath::proto_props[] = {
     JS_STRING_SYM_PS(toStringTag, "Path", JSPROP_READONLY),
diff --git a/modules/cairo-pdf-surface.cpp b/modules/cairo-pdf-surface.cpp
index 77c9d71e..a9403da2 100644
--- a/modules/cairo-pdf-surface.cpp
+++ b/modules/cairo-pdf-surface.cpp
@@ -24,6 +24,14 @@
 #    include "gjs/jsapi-util-args.h"
 #    include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 namespace JS {
 class CallArgs;
 }
diff --git a/modules/cairo-ps-surface.cpp b/modules/cairo-ps-surface.cpp
index fc75774f..798cde7f 100644
--- a/modules/cairo-ps-surface.cpp
+++ b/modules/cairo-ps-surface.cpp
@@ -24,6 +24,14 @@
 #    include "gjs/jsapi-util-args.h"
 #    include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 namespace JS {
 class CallArgs;
 }
diff --git a/modules/cairo-radial-gradient.cpp b/modules/cairo-radial-gradient.cpp
index 3f558a3d..bf6e9bc4 100644
--- a/modules/cairo-radial-gradient.cpp
+++ b/modules/cairo-radial-gradient.cpp
@@ -16,6 +16,14 @@
 #include "gjs/jsapi-util-args.h"
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 namespace JS {
 class CallArgs;
 }
diff --git a/modules/cairo-solid-pattern.cpp b/modules/cairo-solid-pattern.cpp
index cc09ab3c..0894f99a 100644
--- a/modules/cairo-solid-pattern.cpp
+++ b/modules/cairo-solid-pattern.cpp
@@ -18,6 +18,14 @@
 #include "gjs/macros.h"
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 JSObject* CairoSolidPattern::new_proto(JSContext* cx, JSProtoKey) {
     JS::RootedObject parent_proto(cx, CairoPattern::prototype(cx));
     return JS_NewObjectWithGivenProto(cx, nullptr, parent_proto);
diff --git a/modules/cairo-surface-pattern.cpp b/modules/cairo-surface-pattern.cpp
index a4361bbb..ec30ca85 100644
--- a/modules/cairo-surface-pattern.cpp
+++ b/modules/cairo-surface-pattern.cpp
@@ -19,6 +19,14 @@
 #include "gjs/macros.h"
 #include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 JSObject* CairoSurfacePattern::new_proto(JSContext* cx, JSProtoKey) {
     JS::RootedObject parent_proto(cx, CairoPattern::prototype(cx));
     return JS_NewObjectWithGivenProto(cx, nullptr, parent_proto);
diff --git a/modules/cairo-svg-surface.cpp b/modules/cairo-svg-surface.cpp
index cb57707e..d17c806d 100644
--- a/modules/cairo-svg-surface.cpp
+++ b/modules/cairo-svg-surface.cpp
@@ -24,6 +24,14 @@
 #    include "gjs/jsapi-util-args.h"
 #    include "modules/cairo-private.h"
 
+// Avoid static_assert in MSVC builds
+namespace JS {
+template <typename T> struct GCPolicy;
+
+template <>
+struct GCPolicy<void*> : public IgnoreGCPolicy<void*> {};
+}
+
 namespace JS {
 class CallArgs;
 }