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37 lines
596 B
C++
37 lines
596 B
C++
/*
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# decltype
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C++11 keyword
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Replace decltype with type of an expression at compile time.
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More powerful than `auto`.
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*/
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#include "common.hpp"
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int main() {
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#if __cplusplus >= 201103L
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int i = 1;
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float f = 2.0;
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decltype(i + f) f2 = 1.5;
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assert(f2 == 1.5);
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// Implies reference while auto does not.
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{
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int i = 0;
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int& ir = i;
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decltype(ir) ir2 = ir;
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ir2 = 1;
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assert(i == 1);
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}
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// Can be used basically anywhere.
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{
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int i = 0;
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std::vector<decltype(i)> v;
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v.push_back(0);
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}
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#endif
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}
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