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PODoes std::vector use the assignment operator of its value type to push_back elements?
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3272708
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3272731
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2
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CommentCount
4
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CreationDate
2010-07-17T18:22:37.263
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2018-07-21T03:46:12.277
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2010-07-17T18:41:01.320
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383352
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383352
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text
Body
If so, why? Why doesn't it use the copy constructor of the value type? I get the following error: <pre><code>/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc: In member functio n `ClassWithoutAss& ClassWithoutAss::operator=(const ClassWithoutAss&)': /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:238: instantiate d from `void std::vector<_Tp, _Alloc>::_M_insert_aux(__gnu_cxx::__normal_iterato r<typename _Alloc::pointer, std::vector<_Tp, _Alloc> >, const _Tp&) [with _Tp = ClassWithoutAss, _Alloc = std::allocator<ClassWithoutAss>]' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_vector.h:564: instantia ted from `void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = Class WithoutAss, _Alloc = std::allocator<ClassWithoutAss>]' main.cpp:13: instantiated from here /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:238: error: non-st atic const member `const int ClassWithoutAss::mem', can't use default assignment operator </code></pre> running g++ main.cpp on the following code: <pre><code>/* * ClassWithoutAss.h * */ #ifndef CLASSWITHOUTASS_H_ #define CLASSWITHOUTASS_H_ class ClassWithoutAss { public: const int mem; ClassWithoutAss(int mem):mem(mem){} ClassWithoutAss(const ClassWithoutAss& tobeCopied):mem(tobeCopied.mem){} ~ClassWithoutAss(){} }; #endif /* CLASSWITHOUTASS_H_ */ /* * main.cpp * */ #include "ClassWithoutAss.h" #include <vector> int main() { std::vector<ClassWithoutAss> vec; ClassWithoutAss classWithoutAss(1); (vec.push_back)(classWithoutAss); return 0; } </code></pre>
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<c++><g++><std><stdvector><dynamic-arrays>
Title
Does std::vector use the assignment operator of its value type to push_back elements?
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