68 lines
2.9 KiB
C++
68 lines
2.9 KiB
C++
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#pragma once
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#include "../constraint.hpp"
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#include "../string.hpp"
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#include <set>
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#define NS_YYCC_STRING ::yycc::string
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/// @brief The namespace containing convenient function building common used Constraint instance.
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namespace yycc::constraint::builder {
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/**
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* @brief Build Constraint for arithmetic values by minimum and maximum value range.
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* @tparam T An arithmetic or enum type (except bool) of underlying stored value.
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* @param[in] min_value The minimum value of range (inclusive).
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* @param[in] max_value The maximum value of range (inclusive).
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* @return The generated constraint instance which can be directly applied.
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*/
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template<typename T,
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std::enable_if_t<std::is_arithmetic_v<T> && !std::is_same_v<T, bool>, int> = 0>
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Constraint<T> min_max_constraint(T min_value, T max_value) {
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if (min_value > max_value)
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throw std::invalid_argument("the max value must be equal or greater than min value");
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auto fn_check = [min_value, max_value](const T& val) -> bool {
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return (val <= max_value) && (val >= min_value);
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};
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auto fn_clamp = [min_value, max_value](const T& val) -> T {
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return std::clamp(val, min_value, max_value);
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};
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return Constraint<T>(std::move(fn_check), std::move(fn_clamp));
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}
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/**
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* @brief Get constraint for enum values by enumerating all possible values.
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* @tparam T An enum type (except bool) of underlying stored value.
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* @param[in] il An initializer list storing all possible values.
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* @return The generated constraint instance which can be directly applied.
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*/
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template<typename T, std::enable_if_t<std::is_enum_v<T>, int> = 0>
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Constraint<T> enum_constraint(const std::initializer_list<T>& il) {
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std::set<T> data(il);
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auto fn_check = [data](const T& val) -> bool { return data.find(val) != data.end(); };
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return Constraint<T>(std::move(fn_check), nullptr);
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}
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/**
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* @brief Get constraint for string values by enumerating all possible values.
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* @param[in] il An initializer list storing all possible values.
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* @return The generated constraint instance which can be directly applied.
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* @remarks
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* Caller must make sure that the string view passed in initializer list is valid until this Constraint life time gone.
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* Becasue this generator will not copy your given string view into string.
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*/
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inline Constraint<NS_YYCC_STRING::u8string> GetStringEnumerationConstraint(
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const std::initializer_list<NS_YYCC_STRING::u8string_view>& il) {
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std::set<NS_YYCC_STRING::u8string_view> data(il);
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auto fn_check = [data](const NS_YYCC_STRING::u8string& val) -> bool {
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return data.find(NS_YYCC_STRING::u8string_view(val)) != data.end();
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};
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return Constraint<NS_YYCC_STRING::u8string>(std::move(fn_check), nullptr);
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}
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} // namespace yycc::constraint::builder
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#undef NS_YYCC_STRING
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