Programming reference

C++ Functions Reference

Search C++ syntax, standard library functions, containers, algorithms, and engineering programming patterns with concise examples.

Syntax lookup

Find C++ functions and patterns

Filter by function, library, container, programming task, or example syntax.

C++

Best for

Compiled engineering tools

Use C++ for performance-sensitive numerical code, simulation kernels, device interfaces, and reusable libraries.

Watch out

Types and ownership matter

Check integer division, memory ownership, references, const-correctness, and compiler warnings.

Searchable reference

C++ functions, syntax and standard library uses

Category	Command / Function	Purpose	Example / Use
Headers	#include	Import declarations from standard or project headers	`#include <vector>`
I/O	std::cout	Write text or values to standard output	`std::cout << value << "\n";`
Math	std::sqrt	Compute square root from <cmath>	`double r = std::sqrt(area / pi);`
Containers	std::vector	Store a dynamic sequence of values	`std::vector<double> x{1.0,2.0};`
Containers	std::array	Store fixed-size arrays	`std::array<double,3> p{};`
Algorithms	std::sort	Sort values in a range	`std::sort(v.begin(), v.end());`
Algorithms	std::accumulate	Sum or reduce values	`std::accumulate(v.begin(), v.end(), 0.0)`
Files	std::ifstream	Read data from a file	`std::ifstream file("data.csv");`
Functions	return	Return a value from a function	`double area(double d) { return pidd/4; }`
Classes	class	Define a custom type with data and behavior	`class Beam { public: double length; };`
Control	for	Loop over a range of values	`for (double x : values) { sum += x; }`
Build	g++	Compile a simple C++ source file	`g++ main.cpp -std=c++20 -O2`

How to use

How to use C++ reference patterns

Search by task

task -> command -> example

Start with the task you need, then check the command, function, or shortcut syntax before using it in a real workflow.

Check context

version + module + units

Software behavior can change by version, workspace, add-in, toolbox, shell, or engineering unit system.

Verify output

example -> small test -> real work

Use the examples as starting patterns and confirm results with a small test file, sample model, or known calculation.

Document assumptions

inputs + method + result

Record the inputs, method, version, and assumptions so engineering results can be reviewed later.

Workflow notes

C++ workflow notes

Header

A file included with #include that declares functions, types, templates, and library interfaces.

Container

A standard library data structure such as vector, array, map, set, or unordered_map.

Reference

An alias to an existing object, often used to avoid copying and to express ownership intent.

Template

A generic function or class pattern instantiated for specific types at compile time.

FAQ