43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
// =====================================================================================================================
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// Copyright 2024 Medusa Slockbower
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// =====================================================================================================================
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#ifndef OPEN_CPP_UTILS_MATH_H
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#define OPEN_CPP_UTILS_MATH_H
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#include <cmath>
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namespace open_cpp_utils
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{
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template<typename T>
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bool is_prime(T x)
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{
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if(x <= 1) return false;
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if(x == 2 || x == 3) return true;
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if(x % 2 == 0 || x % 3 == 0) return false;
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T limit = static_cast<T>(sqrt(x));
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for(T i = 5; i <= limit; i += 6)
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{
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if(x % i == 0 || x % (i + 2) == 0) return false;
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}
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return true;
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}
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}
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#endif // OPEN_CPP_UTILS_MATH_H
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