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POnon-resizeable vector/array of non-reassignable but mutable members?
 

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  1. POnon-resizeable vector/array of non-reassignable but mutable members?
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    <p>Is there a way to make a non-resizeable vector/array of non-reassignable but mutable members? The closest thing I can imagine is using a <code>vector&lt;T *&gt; const</code> copy constructed from a temporary, but since I know at initialization how many of and exactly what I want, I'd much rather have a block of objects than pointers. Is anything like what is shown below possible with <code>std::vector</code> or some more obscure boost, etc., template?</p> <pre><code>// Struct making vec&lt;A&gt; that cannot be resized or have contents reassigned. struct B { vector&lt;A&gt; va_; // &lt;-- unknown modifiers or different template needed here vector&lt;A&gt; va2_; // All vector contents initialized on construction. Foo(size_t n_foo) : va_(n_foo), va2_(5) { } // Things I'd like allowed: altering contents, const_iterator and read access. good_actions(size_t idx, int val) { va_[idx].set(val); cout &lt;&lt; "vector&lt;A&gt; info - " &lt;&lt; " size: " &lt;&lt; va_.size() &lt;&lt; ", max: " &lt;&lt; va_.max_size() &lt;&lt; ", capacity: " &lt;&lt; va_.capacity() &lt;&lt; ", empty?: " &lt;&lt; va_.empty() &lt;&lt; endl; if (!va_.empty()) { cout &lt;&lt; "First (old): " &lt;&lt; va_[0].get() &lt;&lt; ", resetting ..." &lt;&lt; endl; va_[0].set(0); } int max = 0; for (vector&lt;A&gt;::const_iterator i = va_.begin(); i != va_.end(); ++i) { int n = i-&gt;get(); if (n &gt; max) { max = n; } if (n &lt; 0) { i-&gt;set(0); } } cout &lt;&lt; "Max : " &lt;&lt; max &lt;&lt; "." &lt;&lt; endl; } // Everything here should fail at compile. bad_actions(size_t idx, int val) { va_[0] = va2_[0]; va_.at(1) = va2_.at(3); va_.swap(va2_); va_.erase(va_.begin()); va_.insert(va_.end(), va2_[0]); va_.resize(1); va_.clear(); // also: assign, reserve, push, pop, .. } }; </code></pre>
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    1. COMaybe related - http://stackoverflow.com/questions/2759350/embarassing-c-question-regarding-const
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    2. COIf the size of the arrays are known at compile time, you might get some mileage from std::tr1::array.
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    3. COUnfortunately, the members aren't known statically, and I did catch the related question, but it wasn't quite what I needed. I strongly suspect that I can't do this in STL, but I'd take the cleanest solution outside that. Thanks for the suggestions, though!
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