Created
November 12, 2014 23:09
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static_assert for vector
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#include <algorithm> | |
#include <array> | |
#include <initializer_list> | |
#include <iostream> | |
template <typename T, size_t N> | |
struct V | |
{ | |
static_assert(N > 1, "V"); | |
V(const std::initializer_list<T> & l) { | |
std::copy(l.begin(), l.end(), data_.begin()); | |
} | |
T & x() { | |
static_assert(N > 0, "x"); | |
return data_[0]; | |
} | |
T & y() { | |
static_assert(N > 1, "y"); | |
return data_[1]; | |
} | |
T & z() { | |
static_assert(N > 2, "z"); | |
return data_[2]; | |
} | |
private: | |
std::array<T, N> data_; | |
}; | |
int main() { | |
// если раскомментить, что будет ошибка компиляции | |
//V<float, 1> v1({1.0f}); | |
V<float, 2> v2({1.0f, 2.0f}); | |
std::cout << | |
v2.x() << ' ' << | |
v2.y() << ' ' << | |
// если раскомментить, что будет ошибка компиляции | |
//v2.z() << ' ' << | |
std::endl; | |
V<float, 3> v3({1.0f, 2.0f, 3.0f}); | |
std::cout << | |
v3.x() << ' ' << | |
v3.y() << ' ' << | |
v3.z() << ' ' << | |
std::endl; | |
return 0; | |
} |
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