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expressionhttps://cppreference.com/cpp/language/expressions
1 Definitionhttps://cppreference.com/cpp/language/constant_expression#Definition
1.1 Integral constant expression (C++98)https://cppreference.com/cpp/language/constant_expression#Integral_constant_expression_(C++98)
1.2 Other constant expression categorieshttps://cppreference.com/cpp/language/constant_expression#Other_constant_expression_categories
2 Literal typehttps://cppreference.com/cpp/language/constant_expression#Literal_type
3 Core constant expressionhttps://cppreference.com/cpp/language/constant_expression#Core_constant_expression
3.1 Extra requirementshttps://cppreference.com/cpp/language/constant_expression#Extra_requirements
4 Integral constant expressionhttps://cppreference.com/cpp/language/constant_expression#Integral_constant_expression
5 Converted constant expressionhttps://cppreference.com/cpp/language/constant_expression#Converted_constant_expression
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8 Constant-initialized entitieshttps://cppreference.com/cpp/language/constant_expression#Constant-initialized_entities
9 Usable in constant expressionshttps://cppreference.com/cpp/language/constant_expression#Usable_in_constant_expressions
10 Manifestly constant-evaluated expressionshttps://cppreference.com/cpp/language/constant_expression#Manifestly_constant-evaluated_expressions
11 Functions and variables needed for constant evaluationhttps://cppreference.com/cpp/language/constant_expression#Functions_and_variables_needed_for_constant_evaluation
12 Constant subexpressionhttps://cppreference.com/cpp/language/constant_expression#Constant_subexpression
13 Noteshttps://cppreference.com/cpp/language/constant_expression#Notes
14 Examplehttps://cppreference.com/cpp/language/constant_expression#Example
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