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Issue 995203002: bindings: Add a macro for V8 Maybe<T> APIs. (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Created 5 years, 9 months ago
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1 /* 1 /*
2 * Copyright (C) 2010 Google Inc. All rights reserved. 2 * Copyright (C) 2010 Google Inc. All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are 5 * modification, are permitted provided that the following conditions are
6 * met: 6 * met:
7 * 7 *
8 * * Redistributions of source code must retain the above copyright 8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer. 9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above 10 * * Redistributions in binary form must reproduce the above
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70 #define TOSTRING_VOID(type, var, value) \ 70 #define TOSTRING_VOID(type, var, value) \
71 type var(value); \ 71 type var(value); \
72 if (UNLIKELY(!var.prepare())) \ 72 if (UNLIKELY(!var.prepare())) \
73 return; 73 return;
74 74
75 #define TOSTRING_DEFAULT(type, var, value, retVal) \ 75 #define TOSTRING_DEFAULT(type, var, value, retVal) \
76 type var(value); \ 76 type var(value); \
77 if (UNLIKELY(!var.prepare())) \ 77 if (UNLIKELY(!var.prepare())) \
78 return retVal; 78 return retVal;
79 79
80 template <typename T>
81 inline bool getValueFromMaybe(v8::Maybe<T> maybe, T& outVariable)
82 {
83 if (maybe.IsNothing())
84 return false;
85 outVariable = maybe.FromJust();
86 return true;
87 }
88
89 // The last "else" is to avoid dangling else problem.
90 #define V8_CALL(outVariable, handle, methodCall, failureExpression) \
91 if (handle.IsEmpty() || !getValueFromMaybe(handle->methodCall, outVariable)) { \
92 failureExpression; \
93 } else
94
80 } // namespace blink 95 } // namespace blink
81 96
82 #endif // V8BindingMacros_h 97 #endif // V8BindingMacros_h
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