Aug 29, 2023 · Questions When do I use static, inline, extern, const, constexpr etc. for global variables? How does the answer change historically (before/after C++17, before/after C++20)? How does the …

Dec 14, 2024 · Global constants as inline variables C++17 In lesson 7.9 -- Inline functions and variables, we covered inline variables, which are variables that can have more than one definition, so long as …

Dec 31, 2022 · The extern for the constant is necessary because otherwise it would have internal linkage. In my view the decision to explicitly use extern for all three declarations is good, the only …

Apr 28, 2025 · An inline variable in C++ is a variable that is declared using an inline specifier. It is an exception to one definition having multiple definitions across various translation units. Inline variables …

Aug 14, 2024 · The inline specifier, when used in a decl-specifier-seq of a variable with static storage duration (static class member or namespace-scope variable), declares the variable to be an inline …

In this example, globalVar is declared as extern in the header and defined in source1.cpp, while inlineVar is defined inline in the header and can be used in multiple source files. The main …

Jun 19, 2025 · Introduction C++17 introduced inline variables, a feature designed to address a long-standing challenge in C++: defining variables in header files without violating the One Definition Rule …

Inline variables eliminate the main obstacle to packaging C++ code as header-only libraries. If you need to declare global variables that are shared between compilation units, declare them as inline …