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C++11 constexpr variables support added

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William S Fulton 2014-03-10 07:07:39 +00:00
commit e186dc13b7
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Doc/Manual/CPlusPlus11.html
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@ -107,7 +107,7 @@ For example, ignore the move constructor:
</pre></div>
<p>
The plan is to ignore them by default in a future version of SWIG. Note that both normal assignment operators as well as move assignment operators are ignored by default in most target languages with the following warning:
The plan is to ignore move constructors by default in a future version of SWIG. Note that both normal assignment operators as well as move assignment operators are ignored by default in most target languages with the following warning:
</p>
<div class="shell">
@ -120,20 +120,19 @@ example.i:18: Warning 503: Can't wrap 'operator =' unless renamed to a valid ide
<H3><a name="CPlusPlus11_generalized_constant_expressions"></a>7.2.2 Generalized constant expressions</H3>
<p>SWIG correctly parses the keyword <tt>constexpr</tt>, but ignores its functionality. Constant functions cannot be used as constants.</p>
<p>SWIG parses and identifies the keyword <tt>constexpr</tt>, but cannot fully utilise it.
These C++ compile time constants are usable as runtime constants from the target languages.
Below shows example usage for assigning a C++ compile time constant from a compile time constant function:
</p>
<div class="code"><pre>
constexpr int myConstFunc() { return 10; }
const int a = myConstFunc(); // results in error
constexpr int XXX() { return 10; }
constexpr int YYY = XXX() + 100;
</pre></div>
<p>Users needs to use values or predefined constants when defining the new constant value:</p>
<div class="code"><pre>
#define MY_CONST 10
constexpr int myConstFunc() { return MY_CONST; }
const int a = MY_CONST; // ok
</pre></div>
<p>
When either of these is used from a target language, a runtime call is made to obtain the underlying constant.
</p>
<H3><a name="CPlusPlus11_extern_template"></a>7.2.3 Extern template</H3>